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# How to make parabolic mirrors

### How To Make Parabolic Mirrors From Space Blankets

• Parabolic mirrors are useful for everything from solar power to telescopes to holographic projection. They're usually very difficult to make by traditional m..
• Parabolic mirrors can be used for different purposes like telescopes, holographic projection, or solar power. Now, let's build this exciting project and start harnessing the power of the sun. Image source: NightHawkInLight. Move on to the Next Page video: How To Make Parabolic Mirrors From Space Blankets
• A parabolic mirror has one optical trick that makes it so fun and useful: The vast majority of light that hits the mirror is focused on a single point. This makes parabolic mirrors useful for.
• To meet this condition, we have to define the Focal Point f as two times the y value at the extreme right (or extreme left) of the Parabola, this because the 2 Parabolic Mirrors will be exactly the same. We will use the Parabola basic formula: y = sq (x) / 4*f being f = 2*
• This solar DIY trough mirror produces grid free hot water from energy provided from the sun.http://www.greenpowerscience.com/STAINLESSTROUGH.htmlhttp://green..
• You can make a parabolic mirror from an old satellite TV dish, or a bathroom vanity mirror but that's not fun. Making your own mirror allows you to get the exact curvature you need for whatever you might be burning, cooking or heating. It's a fair amount of work, but the resulting energy the mirror produces is amazing
• ic Wanjihias' flat parabolic mirror comes into play. He replaced the traditional curved mirror with a series of thin strips of mirror, making what appears to be a Fresnel reflector.It's a pretty simple concept, but has a bunch of.

Parabolic mirrors are the practical application of the mathematical concept of a parabola to construct a reflective surface. One of the earliest forms of this type of mirror was the one used by Isaac Newton in the construction of reflecting telescopes. Learn more about the underlying principle of this structure and its varied applications through this ScienceStruck post While some parabolic mirrors are broadband metal-coated first surface mirrors (e.g. with protected aluminum or gold coating), which often exhibit too high reflection losses for use as laser mirrors, others are made with dielectric coatings.Typically, these are highly reflecting (HR) coatings, which often need to be designed for a relatively large range of angles of incidence This blind spot mirror from Utopicar features a longer design for a greater field of view - just make sure that it doesn't take up too much space on your side mirror. These mirrors measure 5.25 inches by 1.25 inches and are a bit more expensive than other two-inch diameter, round options Metal Spinning of a parabolic mirror.diameter: 18,5 inchhttp://www.stirlingshop.d

Building a reflector telescope can be decomposed in 2 steps: make the mirror and build the tube/mount. In this post, we'll talk about the first one which is the most time consuming but also the most interesting. Even though some builders prefer to buy commercial mirrors and fit them in a DIY structure, I believe that making a telescope mirror. How To Make Parabolic Mirrors From Space Blankets — by 'NightHawkInLight'. With fossil fuels dwindling, there is a desperate race to using renewable sources of energy. Solar energy is one. The more intense the light coming from the sun, the more power you can extract from it. This parabolic mirror can help concentrate the sun's rays. http://greenpowerscience.com/SHOPARABLOICHOME.htmlThis simple process forms a very good parabolic mirror shape across a smaller scale. This trash can lid wil..

### Learn To Make Your Own Parabolic Mirrors Using Space

1. in this video I want to expose you to a special class of mirror is called parabolic parabolic mirrors or sometimes called parabolic parabolic reflectors and what's neat about parabolic mirrors and I'll draw a cross section of one right here and if you're familiar with the algebra they are essentially the cross section the cross section especially is in the shape of a parabola so let me draw a.
2. Turn a flat sheet of anything flexible into a parabolic reflector
3. In this video I show how to convert inexpensive truck mirrors into powerful first surface solar concentrators. Check out my sponsor Brilliant for a really fu..
4. Coma is an inherent problem with all parabolic mirrors so it is a compromise you'd need to make. Of course they are ways to reduce it exponentially, primarily through the use of a Coma corrector for telescopes. The Pros And Cons Of A Parabolic Mirrors. A few pros for parabolic mirrors include the following : Produces a more focused imag
5. g plane wave traveling along the axis into a spherical wave.

Mirror makers turn to sub-diameter laps for larger faster mirrors. Deep parabolas can be carved out and zonal irregularities attacked. However, surface smoothness is an issue. A smooth mirror surface along with deep parabolas can be achieved with full-sized or over-sized pitch laps by varying the pitch lap's area of contact let's draw a bunch of parabolic mirrors and what I want to do in this video is do a bunch of examples of objects in front of parabolic mirrors and think about what the images of those objects will be based on how far those objects are and besides just giving us a better understanding of parabolic mirrors this will also it'll hopefully also give us a sense of how do we how do we manipulate or. I can't help but come to the conclusion that everyone who grinds their own mirror is actually making a spherical curved mirror rather than a parabolic, am I right?. I can't see how a parabolic curve can be made with the technique everyone appears to use to grind their own mirrors, because a parabolic mirror's curve is not constant, it's a shape that focuses to a single point AND in phase An aspheric mirror is, like the parabolic mirror, a concave mirror. The aspherical shape of the mirror allows an improved geometric-optical imaging. The group of aspheric mirrors also includes paraboloids, hyperboloids and ellipsoids. These, as well as mirrors with a customer-specific aspherical surface, are among the specialties of asphericons.

Large telescope mirrors are made by spinning a disc of molten glass so its surface assumes a parabolic shape, and then slowly cooling it while spinning so it retains that shape after it solidifies. Mirror blanks up to ten meters in diameter are routinely cast this way How to Make Your Own Telescope Mirror: [Fig 1] This is a large piece of glass a woman off Craigslist gave me. It was 40x40 and 0.75 thick. Its what I decided to use to make the mirror. Cutting it into smaller sections can be difficult but scoring it with a glass cutter I want to make an accurate parabolic mirror with a known focal point. For example, I would want to have it focussed so that a parallel beam could be reflected from the focal point outwards. This will be 3d printed and then used with a tiny sonic transmitter/receiver set up to map surroundings, for a small rover bot. I think this could be done.

You make the mirror out of a plate glass disk or Pyrex glass disk. A first project is usually in the 4 to 10 range. You first grind out the concavity with coarse grit and another glass disk. A.. in previous videos you've seen the properties of concave and convex mirrors and their applications but based on their shape people usually talk about two types of mirrors parabolic mirrors and spherical mirrors so in this video we'll explore what these are and where they're used so if you want to build say a concave mirror which can focus all the parallel rays of light to a single point then. The Mirage Mirror is really two parabolic mirrors with identical shapes. One (mirror A) lays face-up on the table while the other (mirror B), which has a hole in its centre, lays face-down on the first mirror. They are designed so that the focal point of one lies just at the vertex of the other when they are placed on top of one another

For a first project make a mirror in the 4 to 10 range of diameter. It'll take a few weekends. Grinding, polishing, figuring, and coating a small mirror in 1 day can be done, but will require some experience Parabolic reflectors are pretty handy devices. Whether you're building a microwave antenna or a long-distance directional microphone, suitable commercial dishes aren't that hard to come by

all the parabolic mirror examples we've been doing so far have been concave and that just means and you might know already that what concave means but just to make it clear they were we were kind of they were opening out towards the objects and in most of the cases out towards the out towards the where the images were formed so what we cared about the inside we cared about the inside surface. A parabolic mirror takes light from a point source located at the focus and creates a collimated beam. In other words, a source with spherical wavefronts placed at the parabolic focus is converted into a beam with plane wavefronts. The reverse operation is also true; plane wavefronts incident on the parabolic mirror are focused at the focal point in my experience from grinding and polishing a 6 f8, and from reading a lot about it, the natural random motions of grinding and polishing two pieces of glass together will naturally result in a spherical mirror. to make it a parabolic mirror involves, i read, not very much more polishing, a couple of minutes maybe, if done in the right motions. a spherical mirror has a constant radius of. 2-inch metallic mirror tape; Scissors; Step 1. Obtain a 15-inch satellite dish. Remove all of the components including the armature and mounting brackets with the appropriate socket or wrench. Step 2. Clean the interior curved surface of the satellite's parabolic dish with a scrub brush and cleaning solution TECHSPEC® Precision Parabolic Mirrors are available in sizes ranging from 3 (76.2mm) to 16.25 (412.8mm) and are ideal for a wide range of applications. These parabolic mirrors are offered with protected aluminum, enhanced aluminum or protected gold coatings. Uncoated substrates are also available

### Build Your Very Own Parabolic Mirror for Fiery Fu

1. ized and hard overcoated with a protective overcoat, ready for placement in the telescope tube. All mirror surfaces are free of any defects which affect performances. Special types of equipment and techniques make.
2. In its most common form, the primary is a relatively short focus mirror and the secondary is designed to expand the light cone providing magnification. As originally conceived, spherical aberration was corrected by using a parabolic primary and a hyperbolic (convex) secondary. This is referred to as the classical Cassegrain
3. um foil on its inner surface, for reflectivity. The flat sheet can be as cheap as cardboard. However water resistant material, such as plastic or metal, wil

### DIY - Holographic Parabolic Mirrors - the Mirascope : 8

Revolve the area enclosed by hypotenuse, base and axis around the axis line to generate a conical body. Generate a tangent plane and copy (or move) it by the offset distance (33.282) so that it will pass through the intersection of offset distance line and the base line and split the body. Step 3 The splitting plane has the parabola we need A mirror mount is needed to hold the mirror during testing. If the mirror is a 'thin' mirror (i.e. the thickness is much less than 1/8th its diameter) then the mount must hold the mirror without deforming it. The weight of the glass can deform a thin mirror. In my case, I was making a full-thickness mirror, which is a mirror whose thickness is 1/8th the diameter or more, so mirror deformation. ACRYLIC PARABOLIC MIRRORS All Mirrors are TRUE MIRRORS factory professional mirror coating NOT adhesive film. These are the REAL DEAL! True vacuum deposited mirror. 100% made in USA 6 INCH PARABOLIC MIRROR \$29 13 INCH PARABOLIC MIRROR \$49 17 INCH PARABOLIC MIRROR \$69 24 INCH PARABOLIC MIRROR \$109 29 INCH PARABOLIC MIRROR \$159 32 CLEAR AUDIO. A parabolic mirror has a curved shape that will focus parallel light rays coming from a light source (like the sun) onto a single point (called the focal point) which is a set distance from the mirror (the focal length). The problem with this scheme is that a single, solid mirror has a set focal length.. The 3-D mirascope consists of two identical parabolic mirrors that face each other. The top mirror has a hole in the center where the reflected image of an object appears. To create the image you place an object in the bottom of the bottom mirror. This bottom mirror, combined with the identical mirror placed on top, project a real-looking image.

Set the concave mirror on a stand so the center of the mirror is at the same elevation as the laser beam (laser is set behind the object). Set the flat transfer mirror so the beam, directed from the concave mirror hits the flat mirror behind the object To make a parabola: 1. Using pencil or stick, punch a hole to the desired focal point in the box. Maybe 10cm to 15cm from the bottom of the box to focal point The principle of the parabolic reflector may have been discovered in the 3rd century BC by the geometer Archimedes, who, according to a dubious legend, constructed parabolic mirrors to defend Syracuse against the Roman fleet, by concentrating the sun's rays to set fire to the decks of the Roman ships

### DIY Parabolic Trough Mirror made in 20 minutes Stainless

1. Page 1 of 3 - Homemade Mylar Parabolic mirror - posted in ATM, Optics and DIY Forum: I came across this and thought it might be good for making a cheap Dobsonian telescope. Do you think this would work well for making the primary mirror? Make a mylar parabolic mirror I see a couple of potential problems with this. One being difficulty maintaining a focal length
2. This is the focus of all your work - you will turn this flat piece of glass into an accurate parabolic telescope mirror. We recommend a full thickness Pyrex blank for mirrors up to to 12 in size. Full-thickness means the diameter to thickness ratio is 6:1 (i.e. an 8 full thickness mirror is 1.3 thick)
3. My skywatcher heritage is a parabolic mirror. I would think that it would make sense from a manufacturing standpoint for all of the Synta 130mm/f5 mirrors to be the same. Similar thing for the other common mirror sizes. Does anybody know if Synta and GSO make their own mirrors or do they source them from some mirror manufacturer
4. But with larger telescopes you have to make the mirror a more parabolic shape and when you get up to 25 meters there's a big difference between that parabolic shape and a spherical shape
5. To make your own custom parabolic reflector in any size or depth out of tissue, you need to calculate the shape of the tissue segments and where to sew it. I did the math for you here is how. Tools. For my calculation I used the program Grapher which comes for free with every Mac. Few people know it although it is quite powerful
6. g radiations and transforms them into thermal energy
7. Parabolic mirrors are more difficult, and, therefore, more expensive, to make than spherical mirrors. Thus, parabolic mirrors are only used in situations where the spherical aberration of a conventional spherical mirror would be a serious problem. The receiving dishes of radio telescopes are generally parabolic

### DIY: Parabolic mirror Make

He designed the parabolic mirror to focus 1/5th of a square meter of sunlight directly at a hot dog. To do this, he laser cut the frame out of MDF, and using tinfoil, toothpicks, and poster paper,.. I know it's practical to hand grind a convex spherical mirror and that it's practical to make a concave parabolic mirror from a spherical one. But as I understand it, the procedure for doing so depend on tracking progress by using interference patters generated by focusing light off the mirror, and that procedure clearly can't be used (unmodified) with a convex mirror

### Making a flat parabolic mirror Make

1. mirrors have either a spherical or a parabolic shaped concave face. Unlike most other mirrors in your home, the mirror coating of a Newtonian mirror is actually applied to the front face of the glass, not the back. The light collected by the Newtonian primary mirror does not pass through any glass until it reaches the eyepiece. It simpl
2. Another way to make a parabolic arch is to cut off a section of cone (See Fig. 5). The cut line should run parallel to any given straight line on the cone between its point, and a point on its mouth. It may be difficult making this line, or the cut, unless the cone is solid and you can prop it so that the cut line is parallel to the line.
3. of the parabolic reflector. Note: For people who want to make a larger and more efficient solar cooker, I have calculated the mold values for a cooker with double power (see appendix at page 10). However, it should be noted that in this case, the other materials and values must be adjusted accordingly

### Parabolic Mirror: Working, Principle, and Applications

A To make a telescope mirror from a flat disk (of glass), the flat surface has to be changed to a spherical / parabolic surface, because a flat surface can only reflect light in the same opposing angle as it comes to the surface, but for a enlarged view to be seen, the light has to come to a small focal point, at our eye or camera lens, therefore the surface is changed by grinding and. Everyone involved in building giant telescopes agrees that the solution is to make the primary mirror out of multiple smaller mirrors. nearly parabolic surface to about 25 nanometers—about 3. Apply the second mirror layer after you are done with the first. The second layer is composed of aluminum sheets that much thinner and translucent than those used in the first layer and add to the reflective property of the parabolic concentrator. If any air bubbles do form, use the utility knife to make a small incision to let the air out A perfect parabolic mirror will bring parallel rays to a focus at a single point. Conversely, a point source at the focus of a parabolic mirror will produce a beam of collimated light creating a Collimator.Since the source needs to be small, such an optical system cannot produce much optical power Parabolic v. Spherical Mirrors - posted in Beginners Forum (No astrophotography): I think I understand the effect mechanics of parabolic v. spherical primary mirrors, but I really dont understand just how the surface figures differ between the two.Its too tall of an order to ask anyone to explain theory on a forum, but I do have one question

Amateur telescope making is the activity of building telescopes as a hobby, as opposed to being a paid professional.Amateur telescope makers (sometimes called ATMs) build their instruments for personal enjoyment of a technical challenge, as a way to obtain an inexpensive or personally customized telescope, or as a research tool in the field of astronomy Try finding accurate focal lengths, spherical/parabolic, secondary mirror size, weights, lengths. Too teach a lesson to these folks, if it doesn't say parabolic and the f ratio is less than the above chart says, don't buy it. For newts beware the byrd/jones. Again another telescope made to hit a price point and box size Legend tells of Greek engineer and inventor Archimedes using parabolic mirrors to create heat rays to burn the ships attacking Syracuse. Though the underpinnings of that claim are speculative at. parabolic solar cooker. The harnessing of solar energy began with the ancients. They were the first to begin using passive solar design in their homes and to use glass to trap solar heat. The use of curved mirrors to concentrate the sun's rays was developed by the Aztecs, Greeks, Romans, and Chinese. The concept of burning mirrors, for.

Jun 17, 2017 - PARABOLIC DISH MIRROR PARABOLOID DIY REFLECTOR Solar Reflective satellite antenna.If you want to know more, please use keyword adion to search adion's scie.. Demonstration and measurements on superheated steam produced with a self made linear parabolic concentrator using a mirror and an evacuated tube solar collector. Easily tracked concentration of about 1:15. Steam from the sun on a small DIY home made scale could be used to clean drinking water or to make electricity

### RP Photonics Encyclopedia - parabolic mirrors, laser

Still, having the parabolic mirrors is handy because cooking requires heat on the bottom of the pan. I love this culture I stumbled upon. I kinda want to buy a big ass mirror from his website. Reply. The Rocinante on October 26, 2020 at 3:03 am. Concave mirrors. CONCAVE MIRRORS! CON-CAAAAAAVE Figure 1. The basic geometry of a parabola mirror. Light rays coming from infinity will tend to be reflected towards a point called the focus. If we want to make a parabolic reflector to our own particular specification i.e. in terms of its size D (i.e. having maximum y = D/2), height h and focal length a, then equation 1 becomes: a = D²/16h [2

### Amazon.com: parabolic mirro

The first step is to make one part of glass to concave. Earlier we know that the parabolic mirror is a curved in mirror, so our main goal is to make the mirror concave. Your mirror will have a general focal ratio by grinding it roughly I made this solar tracker and parabolic mirror as a small scale experiment to test the idea. The total cost for the tracker and the mirror was less than £50, I'm very pleased with the results and will now make an improved MK 2 Let me draw big parabolic mirrors to make the diagram clear. And let me draw its principal axis. This is a side profile of it. Let me draw its principal axis, just like that. And let's put an object. So I'm going to define a couple of interesting points here. So first of all, we have our focal point Newtonian telescopes use parabolic mirrors because the parallel light from a single, very distant star is converted by the mirror to a single point—provided that the star lies close to the axis of the parabola. The animation above shows the parabola x = y 2 /4, and a series of rays in the minus x direction. At the point where the ray strikes. As we explain in our mirror making demonstrations at the Stellafane Convention, the basic mirror making process involves grinding the mirror blank into a sphere with desired radius of curvature for the target focal length. We then polish this sphere smooth, and then slightly alter it into a parabolic curve

### Making a parabolic mirror - YouTub

Combine a trough parabolic mirror with a linear Fresnel lens and a 10kwatt low temp ener-g-rotor unit and you could supply a home with almost no mechanical parts. Cost is the only problem. Let's make the problems stop. That's what we do, solve problems Past mirror making systems produced a flat surfaced mirror which needed to be ground out in the center in order to make a parabolic curvature. It was then polished and coated with a reflective material. These mirrors were very thick and heavy, even with their honeycombed internal structure Place a circular piece of mirrored acrylic on top of a (near)-parabolic mold of wood (of other material), and gently raising to the softening temperature of the acrylic until it 'melts' into the mold, then letting it cool I would like to use off-axis parabolic mirrors in my simulation but I just couldn`t figure out how to do. Should I use a user defined surface or is there an easy way for this? RE: Zemax- Off Axis Parabolic Mirrors cev (Materials) 24 Aug 04 11:10. Use a standard surface. There are two ways to put in your OAP With an inexpensive homemade parabolic dish mirror (built up using a commercial polymeric aluminised membrane, for instance), you can get with ease temperatures close to 1000°C, much above the.

A solar furnace is a structure that uses concentrated solar power to produce high temperatures, usually for industry. Parabolic mirrors or heliostats concentrate light onto a focal point.The temperature at the focal point may reach 3,500 °C (6,330 °F), and this heat can be used to generate electricity, melt steel, make hydrogen fuel or nanomaterials All the Mirrors in this range come with Ronchi, Foucault and Testing Data. 300mm (12) Glass F/5 Parabolic Mirror \$1480AUD 300mm (12) Glass F/6 Parabolic Mirror \$1400AUD 350mm (13.7) Glass F/5 Parabolic Mirror \$1800AUD 350mm (13.7) Glass F/6 Parabolic Mirror \$1700AUD 400mm (15.8) Glass F/5 Parabolic Mirror \$1980AUD 450mm (17.7) Glass F/5. With the mirror installed in the scope, it's a bit more complex. One thing is certain: at an f/5 focal ratio, if it's not parabolic, performance would be pretty terrible. Even if it is parabolic, this being cheap mass-produced optics, some issues may remain You can get a small satellite dish and hammer it to shape, if you want to do that, though. Sometimes, simpler solutions might be more effective: place a lapel mic in front of a plastic bowl, and you might end up with far better results, as a satellite dish is usually to shallow to converge incoming sound waves into the center Set the flat mirror facing the parabolic mirror and at a distance beyond the focal length (444 mm) of the parabola, so that it will not interfere later with the fibre output and its support. Adjust the height of the mirror to pass the laser through the central hole. Place a small flat mirror in the centre of the hole

### Build your own telescope part 1: The mirror - Thomas

That is why parabolic mirrors are widely used in certain types of telescopes, for example Newton telescopes. Not all telescopes use parabolic mirrors, but whatever surface the mirror of the telescope is, it must be designed so as to eliminate spherical aberration or in the best case, to reduce it to acceptable limits 5) The glass or plastic will transmit a narrower band of the sun's frequencies than the silvered metal mirror of the parabola will reflect. 6) The glass or plastic's index of refraction changes with frequency so different color light will be directed to different foci. The bottom line is, go with the parabolic mirror I thought the parabolic mirror connection was interesting also. Archimedes supposedly used the same principle during the Roman siege of Syracuse about 250 BC to set invading ships on fire. Just think what 10 or so big parabolic mirrors could do at the same focal point. It brings reason as to why the sun was really worshipped by the ancients This mirror is now installed in my equa- torially mounted scope and shows per- fect star images at 500× to 700×. Other ﬂexed-mirror telescopes have Flexing Spheres into High-Quality Telescope Mirrors If you can grind and polish a sphere, you can make a telescope mirror that will leave nothing to be desired Fix the concave mirror in one of the tube ends, with its surface turned inwards. Step 7.From the position of the mirror, make a mark on the tube that measures 10 cm before that of the focal length. Make a hole at the 10 cm mark with a diameter equal to the small cardboard tube. This will be where you place the 'ocular' or eyepiece

provides instruction on how to define the key geometric features of Off-Axis Parabolic Mirrors (OAPs) and describes the concept of axial offsets as a function of off-axis angle. Key Terms: Parent Focal Length, Segment Focal Length, Off-Axis Angle, Off-Axis Distanc M = f 2 /f 1 = R 2 /R 1 = h 2 /h 1. where, M = the magnification of the beam expander f 2 = effective focal length of exit lens f 1 = effective focal length of entry lens R 2 = radius of curvature of exit lens R 1 = radius of curvature of entry lens h 2 = radius of exit spot (image height) h 1 = radius of entry spot (object height). The spacing, t, between the two lenses will be equal to the. Parabolic curves are nothing new — nor are mirrors and reflectors constructed in that shape — but a detailed, thoroughly outlined explanation of the basic mathematics behind them is new.

### Trash can lid to Parabolic Mirror DIY telescope mirror

Four Full-Thickness Mirrors. You should be buying a Parabolic primary mirror - that is the shape of the mirror surface. A parabola is the shape that will focus rays from a distant source to a sharp focus (Your satellite TV dish is also a parabola, it works for radio waves too!) Especially when the mirror gets big. And especially if you strive for excellence. One of the hardest things is to know how to test optics, interpret what you see, and know what to do from there to correct the optical surface to the desired parabolic curve. Steve Swayze has become a master at this delicate craft. telescop I have constructed a double parabolic mirror 40″, system solar furnace mounted on a equitorial powered mount and wonder if your heliostat would do away daily adjustment to efectivly track the sun. Ilook forward to hearing from you with your thoughts For a first project make a mirror in the 4 to 10 range of diameter. It'll take a few weekends. Grinding, polishing, figuring, and coating a small mirror in 1 day can be done, but will require some experience. In the US get the glass, abrasives, pitch, and polish from Newport, Willmann-Bell, or GotGrit. Their websites show some prices

I would put it this way. It is easy to make a parabolic mirror. Now if you want it to be telecope quality, that's different. You need to get the shape correct to about 50 nm or better over the whole mirror while keeping it smooth to about 1 nm. To.. The Mirror Base: the shape of the mirror Basically the perfect shape for our mirror is a parabolic shape. The mathematical formula for a parabola is Y = (X*X)*(1/4F), (), where F is the distance of the focus point from the bottom easy to interpret the condition of the mirror's surface and take appropriate remedial action. An optician proceeds as if he is figuring a spherical mirror and is looking for straight bands with a Ronchi ruling or a null with the knife-edge. A parabolic mirror as seen under autocollimation with a Ronchi ruling

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