Mirrors Definition and 251 Threads

two converging mirrors A & B, having focal lengths 12 cm and 4 cm respectively, are facing each other and 36 cm apart on a common principal axis. A plastic sword is placed vertically upward in front of mirror A at a distance of 18 cm. Locate and describe the nature, orientation and size of the...

Homework Statement I'm looking for someone to clarify a strange result regarding angular magnification. For both mirrors and lens. Homework Equations m(angular) = θ'/θ M(lateral) = h'/h = - d'/d θ ≈ h/d (for small angles) The Attempt at a Solution Using the angle equation, I get a...

Hello Forum , i have a Polygonal mirror with 6 facets of mirrors , i am working in a project for a scan system without lens . I would like to ask you about a document or books to find the formulas of : Scan Angle,The distance between the polygon and the scan plane in a system without a scan...

Homework Statement What is the image distance for an automobile 4.5 m in front of a convex miror with a 0.15 m focal length? I found this to be 0.155 m The question I'm having a problem with is: What is the magnification? Homework Equations magnification = - (image distance/object distance)...

Light is an electromagnetic wave that exhibits both wave and matter-like properties yes? I was wondering what happens to light when it reflects off a mirror. If a tennis ball is thrown at a wall, the moment of contact between the ball and the wall is very brief, so the deceleration rate is...

1. The image of the moon is formed by a concave mirror whose radius of curvature is 4.20 m at a time when the moon's distance is 3.8 x 10^5 km. What is the diameter of the image of the moon if the diameter of the moon is 3480 km? 2. 1/f = 1/do + 1/di M = hi/ho = - di/do 3...

1. Shiny lawn spheres placed on pedestals are convex mirrors. One such sphere has a diameter of 40 cm. A 12 cm robin sits in a tree 1.5 m from the sphere. a) Where is the image of the robin? b) How long is the robin's image? 2. 1/f = 1/do + 1/di 3. a. 1/f = 1/do + 1/di...

Homework Statement Prove that the virtual image in a convex mirror is always smaller than the real object. Homework Equations m = -\frac{d_{i}}{d_{O}} The Attempt at a Solution Not a homework problem. Something which is bothering me, and haven't been able to prove yet. Thanks!

Homework Statement When an object is located very far away from a convex mirror, the image of the object is 18 cm behind the mirror. Using a ray diagram drawn to scale determine where the image is located when the object is placed 9.0 cm in front of this mirror. Note that the mirror must be...

I know that black things absorb all light and white things don't absorb any but what does a mirror absorb or reflect? It reflects all types of light.

Homework Statement A concave mirror with a radius of curvature of 1.4 m is illuminated by a candle located on the symmetry axis 3.4 m from the mirror. Where is the image of the candle? Answer in units of m. Homework Equations The Attempt at a Solution I tried plugging in the...

I've been reviewing time dilation and minkowski diagrams in my spare time and a thought occurred to me which I wanted to confirm. I thought of this when imagining reflections in eyes, so for the sake of simplicity, let's say that mirrors can see. Let's say you have two mirrors which are placed...

Homework Statement A concave mirror (R=54cm) faces a convex mirror of the same radius. The distance between the mirrors is 54cm, and their axes coincide. A candle is held between the mirrors, 10 cm from the convex mirror. Consider light rays reflect off the concave mirror and then the...

Homework Statement A man polishes the insided and outside of a hubcap that is a section of a sphere. When he looks into one side of the hubcap, he sees an image of his face 30cm behind the hubcap. He then turns the hubcap over and sees another image of his face 10 cm behind the...

Homework Statement I solved the problem, but upon further observation, I discovered that what I did didn't make sense. (these are rounded numbers, which shouldn't make a difference in my question) do = 13 cm (do is what I solved for in the problem, and according to the online system it was...

...and you can peer into infinity, right? Now consider pointing a webcam into a computer screen showing its output image. Is the light source at the center of the image recorded by the webcam at infinity?

Hi Part 1 If I shot a laser beam into a square box where each wall is a perfect mirror and the box is filled with a vacuum and devoid of any other material that could interfere with the light beam apart from the perfect mirrors. Q/ Would that light beam continue to bounce around forever...

I was just looking at how a gravitational mass bends/curves light: A sketch is at: http://www.mathpages.com/rr/s6-03/6-03.htm (It resembles spaghetti being turned on a fork...!) This is eerily similar to a mirror bending/reflecting light without the influence of any gravity. Each...

what is better ? a prism or a mirror (to reflect as much as possible wavelengths)

i want to know if any scientists have ever done these-literally shoot a beam of light through a small hole in a "ball" of sorts, and close the hole. the inside surface of the ball would have a mirrored surface and the light beam would bounce around forever. would the ball glow inside due to the...

Homework Statement In the figure are two perpendicular mirrors. The origin is shown by the axes. I am asked to find the positions of each of the images that the observer at point O sees. The coordinates that I found were (-1,2) , (1,-2) , and (1,2), however, my book insists that the...

Hi guys, Recently i had noticed that when i left the hot water in the shower on for a while, the mirrors would fog up if i didnt turn the fan on, so what I am wondering is how is it that the fan can prevent the windows from fogging up, I am assuming the windows fog up because of water vapor...

Light is reflected by two flat mirrors that have an angle q = 114 degrees between them. If the initial ray makes an angle qin = 66 degress with respect to the normal, what is qout? http://img95.imageshack.us/img95/4791/mirrorxz9.th.png I know that the angle of incidence is equal to the...

ok my doubt is wen i look at a concave mirror(behind focus of mirror) i can see image of my face inverted inside the mirror,,,why does this hapen?? acc to mirror laws i shud get a real image tht too not inside the mirror but outside it! y do i observe an inverted virtual image in case of...

[SOLVED] General question about mirrors I'll give you a question as an example. My question to you isn't about solving the question, as you'll see below. Homework Statement A thumb of height 8cm is held in front of a concave mirror of focal length 10cm. The image formed is 12cm from the...

Questions On Security Mirrors! Help! Hello anyone who can help me! I am from Aus, Yr 9 and need some help for an assignment. Here are the questions: What type of mirror is used in shops as the Security mirror? - i have already answered this Why is this type of mirror used?- have...

Hi, I need to build a telescope for my physics class. I need to use any 3 lenses(converging or diverging) and 1 mirror. I was thinking of using an achromatic telescope design for that. However I am not sure what kind of lenses to use and whether I should make the eyepiece from two lenses or just...

Why are we not able to capture and store light between two mirrors? I'm going to take a guess at the answer but I'd like to hear from someone who knows for sure... I'm wondering if you actually can for a small amount of time, but the inefficiencies of an imperfect mirror cause some light to be...

Homework Statement 1) A 24 cd point source lamp and a 73 cd point source lamp cast equal illuminances on a wall. If the 24 cd lamp is 6.3m from the wall, how far from the wall is the 73 cd lamp? Answer in units of m. 2) Two lamps illuminate a screen equally. The first lamp has an intensity...

Homework Statement A 13.0 foot long, nearsighted python is stretched out perpendicular to a plane mirror, admiring its reflected image. If the greatest distance to which the snake can see clearly is 29.0 ft, how close must its head be to the mirror for it to see a clear image of its tail...

A flat mirror that is 0.85m tall is attached to a wall so that its upper edge is 1.7m above the floor. Use the law of reflection and a ray diagram to determine if this mirror will show a person who is 1.7m tall his or her complete reflection. Please help me as I do not know what to do. So...

Homework Statement Just a general question regarding mirrors and how they reflect them. If you take three household mirrors and look at an object or yourself, how does the type of mirror correlate with the amount (subjective) of distortion? Ie. If you look at yourself in a mirror that is...

Homework Statement I have a final tomorrow, and I there are a couple questions that I don't know. When the angle of incidence is the critical angle, the angle of refraction will be? If a screen is moved 3 times the distance from a light source, what will the intensity on the screen be...

is there anyone know how to make a parabolic mirror at home?

Homework Statement Ok, so my profesor asked my to prove this; Prove that f = R/2. To prove it geometrically. .....) .....) .... F ...) _________._____)___________ ......) ......) ....) Ok, so I have that curved convave mirror, now I need to prove that f = R/2, where R is the...

Homework Statement Two parallel mirrors that face each other are placed along and perpendicular to the x-axis at x = +11.00 m and x = -11.00 m. Assume that a point source of light is placed on the axis at x = +2.70 m. In principle, there will be an infinite number of images generated...

Homework Statement Two parallel mirrors that face each other are placed along and perpendicular to the x-axis at x = +11.00 m and x = -11.00 m. Assume that a point source of light is placed on the axis at x = +2.70 m. In principle, there will be an infinite number of images generated...

OK, I have an assessment task to create a 3D model of SOME of Einstein's thought experiments involving trains and mirrors, and present it to the class. Therefore a minimum of 2 thought experiments. The task is unique (ie each student is required to model a different part of the course), and I'm...

I wasn't sure where to post this and i apologize if its already been posted. I think there is an obvious answer for this but for some reason I cannot figure out a consistent answer. I am looking for a mathematical answer more than anything else. When you look in a mirror you image is switched...

I have been pondering for a while upon how mirrors and reflections work. In a standard shiny metal, metallic bonding allows electrons to be free of atoms and thus occupy any energy level. This means that electrons can absorb the photon and re-emit it as the same frequency. However, I still do...

As we know if the angle between two intersecting plane mirrors is 60 degrees 360/60 minus 1= 5 images of an object between the mirrors are formed. what will happen if the angle is 65 or 42,6 degrees?

Homework Statement A tank whose bottom is a mirror is filled with water to a depth of 19.3 cm. A small fish floats motionless 7.50 cm under the surface of the water. What is the apparent depth of the reflection of the fish in the bottom of the tank when viewed at normal incidence...

Tell me if this is feasible. Liquid mirrors may cost only 1/100th the cost of a comparable solid mirror: Friday, June 22, 2007 Molten Mirrors. Liquid mirrors could enable more-powerful space telescopes. By Katherine Bourzac http://www.technologyreview.com/Nanotech/18961/page1/ A...

Hi, I have a question, If a smooth white surface reflects all light, then why isn't my mirror basically a white surface? How come a white surface act as a mirror? Also, I keep hearing about photons being light packets, but I heard that light is an electromagnetic wave, so how can I out the...

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...