Mirrors Definition and 267 Threads

  1. H

    I How Can I Create a Mirror Reflection Illusion?

    please be specific about the number of mirrors I have to use and how large they should be and what angles they should be placed at. And how much light and where should I shed. Thank you. I also made a stupid doodle which I thought might help
  2. A

    Is the Solution for Rotation of Spherical Mirrors Incorrect?

    I think the given solution is wrong. The lens forms image at ##(+75,0)## which is ##25 cm## from pole of the convex mirror which acts as virtual object for mirror. It is true that the reflected ray is rotated by ##2\theta## as in case of plane mirror. Rotation of Spherical Mirrors But that...
  3. H

    I Photon in a mirrored box moving in direction of travel

    Imagine a special box made of inward facing mirrors. These mirrors have zero mass and are perfectly reflective. A single photon is inside the box bouncing from side to side between the two mirrors of the sides of the box. The photon is perfectly preserved in this state, and loses no energy...
  4. elou

    B Light beams and their reflection

    I must add, that, when used in a lit space, or in daylight, spraying before the mirror does not make any light rays visible. Is it simply a matter of light scattering? Also, I am not sure whether this question belongs here or in classical physics.
  5. dykuma

    I Fabry-Perot Interferometer mirrors

    I am trying to build a Fabry-Perot interferometer to make some narrow band filters, and I was wondering if anyone can go into the specifics of whether there's anything special about the types of mirrors used in construction. I started by trying to see how hard it really is to make one on my...
  6. M

    Ray reflecting off intersecting mirrors

    For this problem, The solution is, I don't understand how if ## \gamma < 0## then there will be multiple reflections? I don't understand how ##\gamma## can be negative. Many thanks!
  7. N

    I Two mirrors to focus sunrays into a tiny spot -- possible?

    Hi guys, i am Nenad Komjenović from Bosnia and Herzegovina, I am just a regular guy, who likes geeky stuff and i don't know physics, so i wanted to ask you guys for an opinion. I was inspired by the "Markus Kayser - Solar Sinter Project" Youtube video, in which the guy used fresnel lens to...
  8. Father_Ing

    Could the Image from the First Mirror Be Real for the Second Mirror?

    I'm currently confused in determining whether an image formed by the 1st mirror (the left one) is a real or virtual object for the 2nd mirror. Here is the solution manual: This is what I have in my mind: Since the object is located between the focus and radius point of the first mirror, the...
  9. C

    I Do my parabolic mirrors need to be really shiny to reflect infrared?

    Summary:: Do my parabolic mirrors need to be really shiny to reflect infrared? I have 2 really old CENCO parabolic reflectors. I need to use them to demonstrate infrared light radiation by placing a heat source near one mirror, reflecting its heat to a second parabolic mirror and...
  10. A

    B Reactionless Drive Using Light Bouncing Off Moving Mirrors

    Here is a concept suggesting reactionless drive: Setup: A light pulse of wavelength l0 bouncing between 2 mirrors one on the left - ML and one on the right - MR. Each mirror oscillates perpendicularly to light travel direction attaining relativistic speeds vl, vr. Light pulse is timed so it...
  11. jaumzaum

    B Why we use spherical mirrors instead of parabolic mirrors?

    Parabolas are the only geometrical shape in which we have a perfect focus (not an approximate one) and does not depend in the angle of incidence being small. So, why do we even build spherical mirrors and not only parabolic mirros?
  12. G

    Optics question: Looking at mirrors from parallel to the surface

    I did a little experiment recently where I took a plane mirror and held it underneath a ceiling light. Then, I began to lower my head so that my view was closer and closer to the surface. When I did this, the image of the light began to drift lower and lower in the mirror until it completely...
  13. kspex2

    Two mirrors meet at a 135 degree angle.... (light ray question)

    I tried to use complementary angles and the law of reflection but I still have no idea how to find the angle.
  14. Vanilla Gorilla

    I Black Hole Bomb Effectiveness: Mirrors or Wormholes?

    For the Black Hole Bomb to be effective, does it need the mirrors there, or can they be replaced with wormholes, or some other quirk of spacetime?
  15. Sokolov

    Irradiance of light trapped between two parallel mirrors

    The setup of the problem is shown in the image below. I know that I must add all the contributions of each reflected ray and that its amplitude will be reduced by a factor ##r## each time it is reflected. So after the n-th reflection, its amplitude will be ##E_0r^n##, with ##E_0## the amplitude...
  16. M

    Heat Transfer - Radiation - Net heat transfer between two mirrors

    Hi, So there is already a written solution which I have, but this is more a question about why we omit reflection that come back to the same mirror? Method: Let us consider one of the mirrors, we know it will emit a heat flux given by: q_{1} = \epsilon_{1} \sigma T_{1}^4 . Given that we are...
  17. M

    How do mirrors reflect light so effectively?

    What is a mirror? How it reflects the light?All this knows. The Mirror this smooth surface from hard material. Most of all the metal approaches for its fabrications. Than more smooth mirrors surface, that more light it reflects. In ideal this 100%. Now we look at mirror closely. We see the...
  18. Z

    How Do Two Concave Mirrors with Different Configurations Affect Image Distance?

    Hello ,I have a little question that really confused a lot of poeple but not me , I'll tell you the question , but excuse me if you didn't understand the question correctly , because it was written in arabic , and I changed it into English , anyway ,This qusetion says :You have two concave...
  19. J

    Can You Create High-Quality Telescope Mirrors at Home with Simple Tools?

    Searching the web for telescope mirrors, I came across this website:Is it really possible that someone can grind and polish a large optical surface accurately using simple tools?ThanksJY
  20. R

    Can Light Really Slow Down When Hitting Mirrors?

    A little introduction to this post. I had originally wrote this and posted it on a different board some time ago (one which was not science orientated). I don't know too much about physics as I have just graduated from high school this year. Anyway, here is something I thought of a while ago. I...
  21. J

    Can You Grind and Polish Telescope Mirrors at Home?

    Searching the web for telescope mirros, I came across this website:Is it really possible that someone can grind and polish a large optical surface using simple tools?ThanksJY
  22. J

    How Would Your Reflection Change in a Set of Compound Mirrors?

    I was wondering if you look into a set of compound mirrors (imagine a mirror along each of the planes on the x y z axes) how would your eyes appear if the image reflected was reflected off all three mirrors. I understand the reflected light is parallel to the light before it hits the mirrors...
  23. R

    How Do I Accurately Draw Ray Diagrams for Mirrors and Reflections?

    I'm supposed to draw ray diagrams and determine the experimental "q" value for them. I have 30 problems to do. I think I know what I'm doing...http://ronysv.tripod.com/temp_physics.htmcan someone check out my work, and if it's wrong, let me know what I did wrong?I'd like to compare diagrams with...
  24. G

    Could Large Mirrors Focus Sunlight into a High-Power Laser?

    Could large mirrors be used to focus light from the sun into a high power laser?admin@physicsforums.com
  25. M

    Can Hexagonal Segment Mirrors Improve Telescope Image Quality?

    Hi All.As I understand it:The main limiting factor on a telescope is the size of the main mirror. Bigger mirror = more light collected = better quality image. Due to problems with manufacturing mirror size, or at least mirrors of good enough quality, is limited to a few metres.A quick ponder...
  26. J

    Can You Really Make Your Own Telescope Mirrors at Home?

    Searching the web for telescope mirrors, I came across this website:Is it really possible that someone can grind and polish a large optical surface accurately using simple tools?ThanksJY
  27. Addez123

    Lateral magnification in mirrors, simple issue

    The equation gives us that i = -mp = -0.4 * 30 = -12 The 'correct' answer is +12. Did I miss something here?
  28. NP04

    Magnification for Curved Mirrors

    Magnification |M|<1 = smaller |M|>1 = larger This is my reasoning because the magnification is -d0/di so it is the ratio that matters. Because wouldn't the sign just affect the type of image?? If you consider the sign in image size, you are saying that only one type of image (real/virtual)...
  29. F

    I Light pulse path, length and shape, when bouncing between two mirrors

    Hello, A light pulse moving bouncing between two mirrors (top and bottom) follows a vertical straight path w.r.t. to an inertial observer at rest relative to the mirrors. However, a moving inertial observer see the light pulse move in a zig-zag path as it bounced back and forth between the...
  30. Talisman

    I Mirrors, phase shifts, and position

    I'm confused about something regarding phase shifts but I'm not sure I've pinned down what. I had always thought of a mirror as introducing a global phase shift of π in the position basis, but I only now realize that this makes no sense: of course -A ⊗ B = A ⊗ -B, so a global phase shift is not...
  31. 4

    I Can Time Measurement with Mirrors in Special Relativity Be Improved?

    Special relativity is replete with examples of turning mirrors into clocks. Place two mirrors across from one another, bounce light between them, and measure the time. But as I thought about this, when a photon hits the mirror, it is absorbed by an electron which moves to a higher energy...
  32. Wrichik Basu

    How can this interesting set of mirrors be constructed?

    The mirror that I'm talking of, is situated in Hazarduari Palace in Murshidabad, West Bengal, India. This place was once the capital of Bengal under the Nawab before the British defeated the Nawab in the historic battle of Plassey, 1757. The history is not that important here, but the mirror...
  33. Erik Ayer

    I Is a Quantum-Controlled Mirror Possible?

    I was reading a pdf that mentioned a quantum-controlled beam splitter and wondered whether a quantum-controlled mirror exists. In the beam-splitter case, the beam splitter could either be present or absent, such that path information of photons was either preserved or not. It was controlled...
  34. B

    Making mirrors parallel in a vacuum using charge

    Two identical front surface mirrors are hung in a vacuum chamber with a high vacuum with a bit of bias of their mass wanting to lean into each other so they don't separate on their own. The metal surface is connected to a variable high voltage source. Both mirrors are connected to the same...
  35. H

    I Can Emission Theory Produce Doppler-Shift Formula?

    Emission theories propose that the velocity of light depends on the velocity of the light source. But the ordinary Doppler effect assumes the velocity of light remains as ##c## with respect to the ether medium, even when the light source is moving at speed ##v## with respect to the ether. They...
  36. U

    Do Concave Mirrors Always Form Real Images?

    i want to know the concave mirros is always real images or any difference then how to calculate thanks and regards Uday
  37. rkatcosmos

    Using multiple mirrors in Michelson Interferometer

    The number of mirrors typically used in Michelson Interferometer is 2. I am looking up the respective Wikipedia article and MIT's youtube video. I am wondering, for the sake of one of my experiment, whether more than 2 mirrors can be used in the interferometer? I require the traversing mirror...
  38. J

    Optics : How many images can be seen in inclined mirrors?

    Homework Statement Homework EquationsThe Attempt at a Solution [/B] I tried to draw a rough figure depicting the situation. Here M is the mosquito and I1, I2, I3 are its images . Mosquito can clearly see it's image I1 .Now whether it can see I2and I3 is something I am not too sure ...
  39. G

    I Why doesn't momentum transfer on mirrors reveal which path?

    Hi. In a Mach-Zehnder interferometer, there are mirrors in both paths. When a photon gets reflected on a mirror, it transfers momentum. Also, mirrors are classical objects that are usually not assumed to exist in superposition states. Shouldn't it (at least in principle) be possible to measure...
  40. I

    Placing object between 2 spherical mirrors

    Homework Statement A concave mirror (f1 = 13.6 cm) and a convex mirror (f2 = −7.00 cm) are facing each other and are separated by a distance of 35.8 cm. An object is placed between the mirrors and is 17.9 cm from each mirror. Consider the light from the object that reflects first from the...
  41. W

    Use of prisms vs use of mirrors in periscope

    Hi experts, I am aware using prisms enable total internal reflection while using mirrors there is only reflection of light. The difference is that in the former there is 100% light intensity after reflection while the latter does not. I have also read that using prisms is better than using...
  42. M

    How Do Magnetic Mirrors Enhance Fusion Reactor Efficiency?

    Hello! I hope that i am doing this right. This is my first post of a question. So, I've been reading about a design for a fusion reactor called a "Polywell". The Polywell, as I understand it, works by sending electron beams to the device's center which suck in protons/deuterium/tritium/etc. so...
  43. RabbitWho

    Understanding Focal Length: Solving for Image Position with 1/u + 1/v = 1/f

    Homework Statement u= distance from the object to the mirror v = distance from the image to the mirror f = focal length I don't understand what they are talking about and I would like to 2. Homework Equations If the image is real 1/u + 1 v = 1/f If the image is virtual 1/u - 1/v = 1/f The...
  44. P

    I 'If a photon were trapped between two perfect mirrors....'

    If a photon were trapped between two perfect mirrors perpendicular to its axis of motion, and they were gradually brought together until they were touching, so that the distance between their faces was 0m, would the photon be "trapped" between the mirrors? Without space in which to move, how...
  45. Erenjaeger

    Maximizing Telescope Sensitivity: The Importance of Mirror Size

    A telescopes sensitivity, or how much detail it can see is directly related to the size of the mirror area that collects light from the objects being observed. So a bigger mirror means higher resolution so you can see more detail at greater distances right? does it also mean it can collect more...
  46. G

    Proof of image formation property of spherical mirrors

    Hi. I'm trying to proof the image formation property of a concave spherical mirror. I know you can do this easily with a particular choice of rays (namely one that hits the vertex and one that passes through the center of the sphere) but I would like to show that a generic ray yields the same...
  47. A

    Find the distance from the mirrors for 4 reflections

    Homework Statement Two plain mirrors are put parallelly and 20 cm from each other. A source of light is put between the mirrors, 5 cm away from one. Find the distance from the mirrors of 4 first reflections. Homework Equations a1=a2 The distance of the object from the mirror and the reflection...
  48. F

    Can You Focus on Two Distances at Once?

    Homework Statement You are standing approximately 2 m away from a mirror. The mirror has water spots on its surface. True or False: It is possible for you to see the water spots and your image both in focus at the same time. Homework Equations p=object distance q=image distance The Attempt...
  49. D

    Recoil on mirrors and conservation of momentum

    I wanted to know whether or not a perfect mirror would experience recoil when light reflects off it, and I also wanted to know whether or not light can cause a recoil during total internal reflection. I suspect that the recoil is negligible (Even with a normal mirror) and that you could easily...
  50. Saleh0003

    What will happen -- Mirrors on the Moon to illunimate the Earth....

    if we fix huge amount of mirrors on surfface of moon...can we obtain light on Earth during night ?
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