Mirrors Definition and 257 Threads

A concave mirror reflects an image of the Moon 6 cm form the mirror. If a coin is placed 8 cm from the same mirror, where will its image be? I just want to make sure of something. Since the Moon is very far from the mirror, f is simply the image distance of the Moon. Therefore, all I have to...

Why do very large astronomical telescopes use a mirror rather than a lens for the objective optic?

Moderators: Feel free to move if this is not the appropriate spot:redface: I have been looking at some mirror grinding kits for a telescope making kits; here are three listings for a 10" mirror that are the same in all aspects except for the "wave" aspect. What is this? I am sure it has...

I have been looking through websites with the intent to build a telescope. I have been looking at mirrors today and there are many to choose from including prefabricated ones which I will use for my first scope. But my question is with regards to the the other non prefabricated glass...

I have a question about a thought experiment I read about. I think the question or a similar was asked, and I'm sure others have asked this question, but I'm asking it in this way so it can be answered through the framework of my question. The framework of how I'm understanding it, and so that...

A virtual image is formed by a convex mirror that has a 30cm focal length. Where must the object be placed if the image is to be half the size of the object? I know that since the mirror is convex F is negative (F is the focal length). Useful equations are 1/Do + 1/Di = 1/F, where Do is...

Hi folks. Not expecting much of a response (specialist area) but I'll try. Does anyone know how to inspect mirrors for cosmetic defects?? The HMD project I'm working involves CRT driven combiners, and from that I've become well acquainted with MIL-PRF-13830 on display eyepieces. A...

Rays from the sun subtend an angle theta (in radians) at the pole of a convex mirror (in radians) at the pole of a mirror of focal length f. If the diameter of the sun is D ,then diameter of the image of the sun formed by the mirror is: (a) f theta (b) 2 f theta (c) 6 f theta (d) none...

Two plane mirrors are inclined to each other at an angle. If a ray of light incident on the first mirror is parallel to second mirror, is reflected from the second mirror parallel to the first mirror then what is the angle between the two mirrors. please help me solve it.

why do mirrors reverse left and right but not up and down? thank you very much. Ryan.

I need some help guys with this one. Say you have two mirrors like in the image below, with some angle phi between them. The question is how many images would be formed if the angle between them changed to 20, 30, 40, 60, 90, or 0 degress. Is there some sort of equation that will give you this...

Homework Statement You stand 1.80 m in front of a wall and gaze downward at a small vertical mirror mounted on it. In this mirror you can see the reflection of your shoes. If your eyes are 1.95 m above your feet, through what angle should the mirror be tilted for you to see your eyes...

Homework Statement The EPM has finally crossed the fine line between party tricks and felonies with the genocide of the pigmy marmoset. You are now determined to make him ' pay the price. You fashion a makeshift sherical mirror/laster beam our of a roll of aluminum foil and a stick of...

There are three of us in our physics class... and we are having trouble with concave parabolic mirrors. We use Saxon's physics book, and he does a horrible job at explaining how to solve, or even set up, the problems. If anyone could give advice or insight, it would be greatly appreciated...

hiya I'm having some problems understanding concave mirrors and their reproduction of actual object. 1) Can you show me some proof as to why all rays of light from the object converge at the same point ( image point )? 2) I'm having hard time understanding how person...

1. Two mirrors are placed parallel to each other on a sea-saw. A beam incident in analmost vertical plane, on the first mirror is reflected to be incident on the second and then is further reflected to form a spot on the wall at some distance away. If the sea-saw is turned through an angle...

"A concave mirror of focal length 1m is used to magnify an object by a factor of 4. Where is the object in relation to the pole of the mirror?" Heres what i did: \begin{array}{c} M = \frac{v}{u} \\ \therefore 4 = \frac{v}{u} \\ \therefore v = 4u \\ \end{array}...

Concave mirror experiment We did an experiment with a concave mirror Concave mirror was placed on optics bench and a candle was placed at designated spots. A screen was used to see where the image was projected. But a strange thing happened. When the object was placed at the focal point, image...

1)For my homework, I received a question, I'm supposed to use Snells law and a protractor. Basically, I have an odd shaped object that forms a messed up sphere. I have an arrow going in at a specific point and I'm given n = 1.0 (for the light ray outside the sphere) and n = 1.2 (for inside...

Inclined mirror problem Sir, Please see if it is right. 1)A ray of light makes an angle of 10 degrees with the horizontal and strikes a plane mirror which is inclined at an angle y to the horizontal. What is the angle y for which the reflected ray becomes vertical? I solved it in the...

Sir, Two plane mirrors M1 and M2 have a length of 2 meters each and are 10 cm apart. A ray of light is incident on one end of mirror M2 at an angle of 30 degrees. What is the number of reflections light undergoes before reaching the other end? I solved it in the following way: In each...

Sir, A driving mirror consists of a cylindrical mirror of radius 10 cm and the length over the curved surface is 10 cm. If the of the driver be assumed to be at a great distance from the mirror, what is the field of view of the mirror in radian? I don’t have any idea about cylindrical...

Sir/Madam, 1)The 2 adjacent walls and the ceiling of a rectangular room are mirror surfaced.What is the number of images of himself does an observer sees? If it was the case of 2 mirrors I know it is 3. But here there are 3 mirrors which are mutually perpendicular. But if we take 2 mirrors at...

Hi there Just wondering if someone is able to check my 'table' I made up... Lens: Convex lens are converging and focal length (f)=(+ve) Concave lens are diverging and f=(-ve) Mirrors: Convex mirrors are diverging and f=(-ve) Concave mirrors are converging and f=(+ve) Is this...

how can you tell when the image will become real or virtual in a concave mirror, the distance?..i'm not sure thanks in advance *edit* oh i think i know..is it the magnification, if the magnification is more than 1 then that means its virtual since it would be upright and a bigger image...

As far as I understand, the film inside a photo camera is positioned in such a way that every light ray that hits some spot X on the film comes from a single source on the object being photographed. Here's what I mean: http://static.howstuffworks.com/gif/camera-diagram3.gif The various...

6-foot tall person stands in front of flat mirror. How tall must mirror be for this person to view his full body/image? <-Yeah, that's a question.

Hello, I have a question about mirrors. Wikipedia says, 'Most modern mirrors consist of a thin layer of aluminium deposited at the back of a sheet of glass.' My question is, how does the aluminum at the atomic scale reflect the incident light so precisely? In other words, IF incident...

We have to show that in a conductor an E field can exist but it decays according to the skin depth as follows: Ex = Eo*exp[i(z/d - wt)exp(-z/d) where d is the skin depth, w is the frequency etc. I can answer this part. We are also asked to show that the power lost per unit area in this...

Hello everyone, I tried a problem on concave mirros and i have no idea why this is wrong. I was given enough info but still didn't like it. Here is the problem: Spherical mirrors. Object O stands on the central axis of a spherical mirror. The table gives object distance p, the type of...

If we have two mirrors, each one facing the other (producing what i'll describe as recursive reflection) then, supposing we could zoom into one of the mirrors as much as we'd like, then at what point would the image become unrecognizable. Would there be a microscopical-sized reflection of the...

What are the ways that things can be reflected through flat, converging, and diverging mirrors? I know that for flat mirrors it's a virtual image equal to the size of the object For the converging mirror, if the object is placed farther than the radius of the mirror, the image is real and...

Hello, I was wondering how to find the minimum height of a mirror so somebody of height H that is at a distance D of the mirror sees himself from head to toes. Anybody can help me out ? Thanks !

Hi, Question Some rearvier mirrors produce images of cars behind you that are smaller than they would be if the mirror were flat. Are the mirrors concave or convex? What is the mirror's radius of curvature if cars 20.0 m away appear 0.33x their normal size. My Answers The mirrors are...

Is it possible to melt a perfect mirror by radiative means? (reflects light of all frequencies with no absorption) Which leads me to ask. What is the mechanism (at the atomic level), for the reflection of light? I've never had a satisfactory answer on the mechanism of reflection. Is it...

An object that is 31 cm in front of a convex mirror has an image located 20 cm behind the mirror. How far behind the mirror is the image located when the object is 19 cm in front of the mirror? For this problem, I know I have to use the mirror equation but I keep getting the wrong...

Convex mirrors are being used to monitor the aisles in a store. The mirrors have a radius of curvature of 4 m. What is the image distance if a customer is 20 m in front of the mirror? From using the mirror equation, i came up with an answer of 1.82m but when i submitted it for webassign, it...

A light ray in air enters and passes through a square block of glass. What can be stated with regard to its speed after it emerges from the block? a) Its speed is less than when in glass b) Its speed is less than before it entered glass c) Its speed is same as that in glass d) Its speed is...

I have 2 questions regarding mirrors: If you look at yourself in a shiny Christmas tree ball with a diameter of 9.0 cm when your face is 30.0 cm away from it, where is your image? Is it real or virtual? Is it upright or inverted? I know the mirror equation is: (1/object distance) +...

Hello, here is the problem i am having trouble with. The sun falls on a concave mirror and forms an image 3 cm from the mirror. If an object 24mm high is placed 12 cm from the mirror, where will its image be formed? So far, i have decided that since 1/f = 1/do + 1/di... 1/f = 1/do + 1/3 =...

I know that magnification of a single convex mirror is always positive (that is, greater than 0) based on f<0, but does the size of the magnification depend on the magnitude of the object distance?

I am trying to build a laser, and this is the 'genral forums' so i hope it is the richt one. My question is can a normal mirror be turned into a half-silvered mirror in a process that can be done at home?

Hi everyone--I've been mulling over a homework question from earlier in the term: Suppose you are standinig in the middle of two mirrors of length L separated by a distance D. ((i.e. if you are standing at the origin, the centers of the two mirrors are at x=\pm \L/2)) The mirrors are at a...

I'm trying to construct a model for an electron trapped in a magnetic mirror, but i just can't get my head round why the electron stops and changes direction if the field doesn't affect the parallel velocity (lorentz force), anyone got any ideas?

Reflection in Mirrors! AAARRRGHHHH >> How many times will the incident beam be reflected by each of two parallel mirrors that are 1.60m high and 1.40m apart? The beam is aimed at the left mirror at 5 degrees from the horizontal. Okay I am completely lost here. I've read over all my...

I just have 2 questions. If you use a mirror under water would the focal length change? And same question, but if you use a lens under water would the focal length change? I was thinking, light rays travel slower in water, so then it difracts away from the normal more than if it was in...

For a class, I need to design a basic overhead projector. I know a little bit about optics from an algebra based physics class I took a while back, but I don't remember most of the specifics, such as what kinds of lenses flip objects before and after their focal points. I'm also not sure what...

Can someone point towards some useful information for me about the frequency dependence (over the audio frequency range) on acoustic mirrors, acoustic waveguides/horns and interfenece and diffraction effects please? Thanks

It may seem to be a stupid question but please take a serious look at it: 1) (hypothetical): Imagine a perfect hollow orb (ball, sphere...) of some heatproof material - inside metallized to reflect most wavelenghts of light (a one-way-mirror). Assumed a perfect vacuum inside: what happens...

I would like to offer one simple experiment. It can be repeated by everyone. I am interested in conclusions which it is possible to make of this experiment. In my opinion, a correct conclusions can have the important consequences. So. Two flat mirrors are located in parallel on distance...