Mirror Definition and 630 Threads

I'm unsure what the purpose of this is. I have looked it up but can only find some explanations stating "role is to convert the differential current input signal to a single ended voltage signal without the intrinsic 50% losses and to increase extremely the gain." I'm not sure what double...

When we look at a mirror we see our image but the light that reaches our eyes also reflects off our bodies back to the mirror again and back to our eyes. Do we see multiple images of our self but somehow ignore all but the primary reflection?

Homework Statement a) You wish to have a plane pocket mirror that is as discreet as possible but with which you can see the whole width of your face. If your face is 23.0 cm wide, what is the minimum width, in cm, of the mirror for you to be able to see the whole width of your face in one eye...

http://discovermagazine.com/2005/jun/cover/article_view?b_start:int=3&-C= Any updates on the mirror experiment depicted in the above drawing to refute or proof Penrose theory?

This actually happened to me in a hotel in Bali. It was night time and a light from the street was reflecting off of the mirror onto the wall. In front of the mirror was a statue of a goddess. Projected onto the wall were two separate shadows of the goddess, rotated with respect to one...

if light hits a mirror and then switches direction... if light hits a mirror at a 90 degree angle, wouldn't it HAVE to travel slower than the speed of light when it hit the mirror?

not sure if this is posted, so imagine i have a 3- dimensional cube. let's say its about 10m x 10m x 10m in volume. this cube is empty on the inside but its inner surface is covered with mirrors. normal plane mirrors all around the walls, like tiles but instead mirrors. so what happens if i...

Hi, http://imageshack.us/photo/my-images/141/optica.png/ The sphere in the picture is made of glass with n = 1.60. The curved side of this sphere is a mirror. The question is why we see two images of the black dot. Homework Equations Snells law? The Attempt at a Solution One...

Homework Statement Imagine that you are looking at yourself in a mirror mounted on a wall. From where you stand, you are able to see from the top of youre head down to the top of your shoulders. Suppose you were to back away from the mirror. Would the amount of your body that you see in the...

Hi I need a brief explanation on how a Current Mirror is used to Bias an NMOS using Constant Current Model. My Doubts are :- * Where the input is given ? * If the current remains constant how does it work ? * If the current does not remain constant then why say constant current ? Bit...

A pin AB, 1cm long, is placed at an angle to the principal axis in front of a concave mirror, of focal length 5cm. Point B lies on the principal axis at a distance of 4 cm. Point A is such that the angle ABP is 60°, where P, the pole, is the point where the principal axis intersects the mirror...

I posted earlier asking if my science fair idea—to use many mirrors to reflect light onto one point—would work. After getting a reply that it would, I now have another question. It's clear that I have to use a curved board to mount the mirrors onto, or I would just get reflection of straight...

It takes longer to write out a question and your working, than it does to even get a reply.. And that reply either never comes or is something along the lines of 'I can't tell what you've done'. Latex is so harsh to use, is it possible to install something to mirror microsoft word equation...

Optics -- plane mirror Homework Statement Revered members, Kindly see my attachment. I don't understand the role of dotted lines in the diagram. Actually , DA, EC and NB are perpendicular bisectors. In the first place, why should we draw perpendicular bisectors? Can't we solve the problem...

"real" image from concave mirror Ok so in we are currently doing mirrors and reflections in physics and from what I learned there are 2 types of images: real and virtual. I know that a virtual image is what you see INSIDE the mirror; but what does a real image looks like? I can't find anything...

I have just recently read about the thought experiment called 'Einstein's mirror'. I understand that the imaginary experimenter loses his reflection in the mirror when he travels at the speed of light through the luminiferous aether. The loss of reflection itself is enough evidence for Einstein...

Homework Statement Determine the minimum height of a wall mirror that will permit a 6ft person to view his or her entire height. Sketch rays from the top and bottom of the person, and determine the proper placement of the mirror such that the full image is seen, regardless of the persons...

Hello guys I wonder if you can help me? Basically for a project I’m going to produce a led light source with 12 leds with a single small driver that runs on 24v supply. The LEDs run 3.7v typically so that would require 44.4v that’s a lot more than the led driver can supply but if I run 2x 6...

Homework Statement A telescope contains 3 large mirrors. The time (in years) until a single mirror fails has been investigated and we know that the probability that a mirror is still fully functional after t years is e^(-(t/10)^5 ) a) All mirrors must be working to take the most detailed...

I only know time dilation in it's basic form and it was explained to me beautifully using mirrors in a spacecraft . The light would go vertically, taking longer if you were at a stationary frame looking into the spacecraft . This all made sense to me; however, what would happen if the mirrors...

Any suggestions on vendors for good, well-designed reflecting telescope mirror holding cells, in the ~ 8" diameter range? I've had enough grief from the very poorly-designed cell that holds the primary in my 7" Mak-Newtonian, and am looking to toss it and replace it with something better. Tube...

I have a question and I would like some help. Assuming mirror image vehicles hitting at 65mph. Is the force exacted on each vehicle equal to 130mph or 65 mph. My assumption is that it would be the same as hitting an inelastic brick wall.. Thank ya'll in advance..

Homework Statement A science museum has created a huge concave mirror with a focal length of 5 m, and mounted it so that it covers the entire wall at one end of a long hallway. If you stand on a center line painted down the middle of the hallway, you're on the mirror's principal axis. You...

How Does Reflection Behave In Arbitrary Surfaces Hi I am interested to know how reflection would behave in a mirror on a surface of negative [gaussian] curvature. I tried googleing it and found nothing useful Thanks Edit: Reflection in a sphere behaves like inversion in a sphere...

Homework Statement A dentist uses a spherical mirror to examine a tooth. The tooth is 1.13 cm in front of the mirror, and the image is formed 10.8 cm behind the mirror. Determine the mirror's radius of curvature. Homework Equations 1/p+1/q=1/f f=R/2 The Attempt at a Solution...

Homework Statement An object 2.71 * 10-2m tall is 0.14m in front of a convex mirror that has a radius of curvature 42cm. Calculate the position and height of the image, is the image inverted or upright? Homework Equations Well, I've stated that I'm using the ray model of light. As far...

Is it possible to build a large mirror array (around 10 km²) with adjustable focal length (from 10 meters to around 400 kilometers)?

Quetsion about "Mirror Matter" Hello All, Some physicists today call about "mirror matter"( http://en.wikipedia.org/wiki/Mirror_matter ) On some other forums,some people suggested that this mirror matter may help to solve maind/body problem.Ana some even supposed that existence of the mirror...

Homework Statement difference between convex lens formula and convex mirror formula The Attempt at a Solution for convex mirror you make focal point negative and use the 1/f = 1/do + 1/di but for convex lens do you do the same? you don't make the f negative i think am i...

Where is the best location for a light bulb filament to be placed in a spotlight, when using a concave mirror? It makes the most sense to put it at the focal point of the mirror if you want parallel light beams but are you supposed to have parallel light beams when you use a spotlight? Or do...

Homework Statement Two point charges +q and -q are placed respectively in positions (-a, 0, +a) and (-a, 0, -a) of a cartesian reference frame, with a being positive and known. The half space of positive x is fully occupied by a conductor. What are the positions and values of the mirror...

Homework Statement A body is positioned 40 cm from the left of a lens (f=30) and the lens is positioned 100cm left of a convex mirror (|R|=60), where will be the image and what type and magnitude will it have? Homework Equations 1/u + 1/v = 1/f The Attempt at a Solution I tried to...

the reflective side of the mirror was mistakenly placed on the inside of the office. so the people inside it can see themselves but not what is on the outside, how can this be remedied?

A plane mirror is placed horizoually at the bottom of a transparent liquid of 10cm depth. When one looks at the image of a small object floating at the surface of the liquid right above the object, the image is seen at 14cm below the surface of the liquid. Find the value of the index of...

Hi is there a broad laser mirror for UV laser in the range which contain the invisible light and a 190nm? and where can I find such mirror? Thanks

1. Homework Statement - A concave mirror with a focal length of 4.7cm has a 1.8cm object 9.4cm in front of it and i need to know the distance, height, and magnification of the image also i need to figure out how to locate the image by drawing a ray diagram 2. Homework Equations - all i...

Just a check here... I'm doing some ray diagram practice for optics and I've hit a road block. Hyperphysics is stating that for a concave mirror o is usually negative due to it measured against the direction of light propagation when applied to the mirror equation (below)...

Guys, I have an ODE like this: The following code was used to generate this LaTeX image: \frac{d^2y_{1}}{dx^2} + \frac{d^2y_{2}}{dx^2} + y_{1} + y_{2} = 0 where, y1 (x) =y2 (-x). Do you have any idea how to solve it? Thanks in advance.

Homework Statement If a light beam is circularly polarized and then bounced off a mirror perpendicular to the optical axis, what is the new polarization. My thought is, because circularly polarized light has basically 2 components behaving like waves, each of them is going to experience a...

Homework Statement A woman stands between a vertical mirror, 0.5 meter tall, and a distant tree whose height is H. she is 1.0 m from the mirror and the tree is 9.0 m from the mirror. If she sees the tree just fill the mirror, what is H? Homework Equations m = (hi/ho)/(-di/do) hi =...

Question: If you were to theoretically shine a laser into the intersection of two mirrors, what would happen to the reflected beam? When I say 'theoretically' I mean that the beam would hit the corner perfectly. I'm confused by this because the derivative of a sharp point on a graph is...

If paper ignites at 500 C, can one start a fire with a typical shaving mirror using sun light? Since the only time a concave mirror has an upright, virtual, magnified image is with the object between the mirror and focus, I estimate a focal length of about 1m. Now, the sun is at...

Homework Statement A man holds a double-sided spherical mirror so that he is looking directly into its convex surface, 47.4 cm from his face. The magnification of the image of his face is +0.18. What will be the image distance when he reverses the mirror (looking into its concave surface)...

Homework Statement Please see here: http://img198.imageshack.us/i/unledev.jpg/ object placed 8 cm before the slab(6 cm thick,silvered at other end). The final image is formed 10 cm behind the mirror.Find refractive index of slab. 2. The attempt at a solution n is refractive index...

The problem: "A convex spherical mirror is 25 ft from the door of a convenience store. The clerk needs to see a 6 ft. person entering the store at least 3 inches tall in the mirror to identify them. What is the radius of the mirror?" d_obj = do = 25 ft = 300 inches h_img = hi = 3 inches...

i need help in these equations please : Q1 - if there is a frequency 440Hz for a sound wave in air with velocity 430 m/s calculate wavelength and wavenumber. --------------------- Q2- the speed of light about 3X 10⁸ m/s find the wave length and wave number for the frequency 5x 10¹⁴ Hz...

I was posed this question by a professor, and thought I would share with the online community! He asks, "if one were to use simple glass, how could they use it as a mirror, where 100% of the light is reflected?" The glass is transparent, but his hint was to look at a window! Whats your thoughts?

how can we say that the image formed by a concave mirror is always real if object is virtual? please help

When light is partially reflected by a half-silvered mirror, as in an interferometer, do the reflected and transmitted beams have different polarizations? Is this answer the same for all half-silvered mirrors, or does it depend on the metal coating used and/or the optical properties of the...

Homework Statement You need to place a mirror on the left wall of the figure so that the reflected light from the bulb exactly fills the right wall. A) What is the proper height of the mirror? B) How far below the ceiling should the top edge of the mirror be? Homework Equations...