Mirror Definition and 630 Threads

Homework Statement A person accidentally bit his tongue and wants to examine the bite by using a concave mirror. The mirror is placed 10 cm from the bite with the result that a virtual image of the bite appears 4 times actual size. Find the parameters s (distance from object to mirror), s'...

Homework Statement Still I could not make the exact difference between the back silvered and the front silvered mirror. In many web sites only the method of making a back silvered mirror is given. My doubt is-"what makes the deposit back silvered or front silvered?". How will you say that...

When you look at a spoon, like at a mirror, the image of yourself appears to be on the other side of the mirror/spoon, where light does not go! So the image must be virtual! So tell me, since a concave mirror must produce a real inverted image when you are far from the focal point...

I was told today that when a photon hits the mirror it is absorbed by the atoms in the glass then reemitted by the matter , then I was told that the photon that is remitted can emit before the initial photon gets their . How does this work , Is it possible that the photon has magnetic field...

is it possible to make a "gravity mirror"? Does anyone out there know if under today's accepted laws of physics it would be possible for something to exist that could reflect gravity?. The reason I ask is because I am a bit of a late starter with this physics thing. I did schoolboy physics...

Hello, my name is Edward Solomon, after much experimentation and calculation I have failed to make a system that can reflect light in a closed system. Now I am not naive enough to believe I can make a true closed system. There is an absorption and conversion to heat each time light strikes a...

1. Find the length of the curvature of a concave mirror of 20cm that comply with paraxial approximation for all incident rays 2.conventional geometry formula , sinθ≈θ or tanθ≈θ for paraxial rays 3. I had try drafting out the diagram , labeling all the unknown angle with symbol and...

Recently, I asked my physics teacher how to measure the height of a virtual image behind a concave mirror. He said he wasn't exactly sure so he offered to give extra credit to anyone who could find information on how to do it. Is there anyone who can help?

i know the question may be a bit stupid to some people, but i seriously don't know how to do it... Homework Statement How far must the movable mirror of a Michelson interferometer, illuminated by a 589-nm source, be displaces for 2000 fringes to move past the reference point? Homework...

A bus driver looks into a plane mirror 20 cm long which is placed 50 cm in front of him. If the rear window is 500 cm from the plane mirror, through what length of the rear window can he see whenever he looks into the mirror while driving? I have thought about this question but am...

I've two questions here:- 1) Sound reflects it is said using laws of reflection of light.So,it means we hear max. sound when angle of incidence is equal to angle of reflection,right?& if not equal then what do we hear or not? I guess we hear lesser than max.sound when the angles are not equal...

I have two identical HDs in my PC and periodically, I back up from my primary drive to the slave to keep copies of modified files current. Is there anybody here using a software-based Raid or Mirroring solution to keep a HD duplicated in real-time (or perhaps batched overnight, etc)? I'll...

Plane Mirror A person walks into a room that has, on opposite walls, two plane mirrors producing multiple images. Find the distances from the person to the first three images seen in the left-hand mirror when the person is 5ft from the mirror on the left wall and 10 ft from the mirror on the...

My professor today told us to think about the following situation: If there is a 99% reflecting mirror, then if a beam of light shines on the mirror 99% of the light is reflected and 1% is transmitted. Now he says that if a second 99% reflecting mirror is placed behind the original mirror, 100%...

i had this thought a while ago and would like to have an answer i don't know whether or not this exists already so i thought i'd sign up and ask a forum, this is somewhat a what if question if a ball like object(more a ball with many sides don't know the technical name) was made out of a...

Homework Statement You have a thin lens with a concave and a convex side (let's say with radii r and R). You also have 2 mirrors, a convex one, that fits perfectly into the lens' concave side, and a concave one, that fits perfectly onto the lens' convex side (so the corresponding radii of...

Hi everyone A few weeks ago, I had worked out the relations between the angle of reflection and angle of incidence in case of reflection from a plane mirror, (1) moving toward the incident ray (2) moving normal to the incident ray (PS -- This is not homework.) The way I did it was...

A race-car driver is driving in a circle at a fixed velocity. He has a cross hanging down from a string on his rearview mirror. Which of the listed forces impacts the hanging cross as the driver drives around a circle at a fixed velocity? Gravity, Friction, Tension, and Centripetal Force I...

So one of my friends from my Astronomy club has given me a 6in mirror blank at our club mtg last week. I'd like to try my hand at making my own mirror. I didn't have time to stay and ask questions ( dropped into return an astronomy lecture vid to our library). How do i go about doing so? I'd...

A string is hanging from the rearview mirror of you car and a ball is at the end of this string. Suppose that you drive around a circular track at fixed speed. Which list below gives all the forces that act on the ball? A) tension and the force of gravity b) tension force of gravity and...

Homework Statement In the attached picture , It has been explained in my book that " I[FONT="Fixedsys"] the apeture of the mirror is small, the point P'( ponint of incidence) is very close to the point P( pole) ,Then PF(focal length)= P'F :. PF =Fc or PF=1/2R" I don't get it ...

Hello forum , i have a spindle motor from an HDD and i pasted to this motor 6 facets polygonal mirror, the problem is that the mirrors are not 100% alignment ( it's hand made) and the laser reflected from this mirrors is doing 6 lines ( where it should be one line if all mirrors are good...

If a spherical mirror has a radius of curvature of .24 m and and object is placed in front of it and magnified to twice its size: is the mirror concave, convex, or either? And what is the object's distance? I determined that the mirror was concave, because the question said that the image was...

If you are running towards a mirror at 5m/sec, at what speed is your reflection moving towards you?

I've been pondering this for a while. 2 questions. The first question is how does a mirror work. Think about it, why and how does it reflect a near perfect image? My second question is why don't other things reflect light like mirrors do. More specifically, why doesn't a white piece of paper...

[SOLVED] Focal length of a mirror Homework Statement A 2.0-cm-tall object is placed in front of a mirror. A 1.0-cm-tall upright image is formed behind the mirror, 150 cm from the object. What is the focal length of the mirror? Homework Equations 1/f=1/s+1/s' m=h'/h m=-s'/s...

I wonder how does Lloyd's mirror works, how does it produce the interference pattern? I look for many textbook, but all of them only tells the result and the setup without telling how to get the fringe and how to get the fringe separation. Anyone show me some hint or recommend me a book about...

Homework Statement 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. When the object was placed between the focal point, image was not produced on the...

Hi, We're offered shaving mirrors by suppliers and sometimes their claims to the magnification are doubtful. I don't wish to upset any customers by giving incorrect information. So is there a practical way in which I can test the magnification myself? i.e. measuring the distance of the...

Homework Statement A man is 160 cm tall and hiss eyes are 150 cm above the floor. He looks at his image formed by a plane mirror pleaced on a wall. Homework Equations a) In order to see his feet, what should the distance beetwen the bottom edge of the mirror and the floor be? b)To see...

Homework Statement Question B only Homework Equations The Attempt at a Solution 1) Why we use f=15.0cm? Shouldn't it be f=infinity considering plane mirror have an infinity focal length? 2) Normally I do combination(lens, mirrors), firstly I will consider the front...

This isn't homework, I really have this setup. :-) I have an 18" mirror with an 80" focal length. The light from a point light source at twice that distance (and offset to the side slightly) bounces it's beams off the mirror and back to form a perfect image of itself next to the light if you...

Where do you put an object in front of a concave mirror of focal length 10 cm to produce an image that is inverted and 2.5 times greater than the object? I have no idea how to solve this.. help..

Homework Statement A concave mirror of focal length 10cm in air is put into a beaker containing a liquid up to 7.5cm. Refractive index of the liquid is 1.2. What is the focal length of the mirror inside the beaker? The Attempt at a Solution I tried proportion method: Depth...

Homework Statement If you are walking towards a mirror at 7 m/s, how fast are you and your image approaching each other? Answer in m/s. Homework Equations --- The Attempt at a Solution I'm not sure how to solve this mathmatically but when I first looked at this question, I just...

Distance and your image on a mirror?? 1. Homework Statement A) If you are 1 meter away from a plane mirror and approach the mirrow at 1 m/s, how long does it take you to reach your image? B) At what speed do you approach your image if you walk towards a plane mirror at 1...

Assume that your eyes are located at the top of your 1.60 m tall body. a) What size plance mirror would you need to see your whole body if you were standing 1 m from it? b) How far from the floor should the bottom edge of the mirror be placed? c) How would your answers to (a) and (b) change...

Hi, I read several literatures on quantum cryptography plug and play system. I found out that Faraday mirror was used to compensate polarization fluctuations. Photons are reflected orthogonally by Faraday mirror and their polarization changes will then be autocompensated, provided they follow...

Homework Statement You slowly back away from a plane mirror at a speed of 0.10 m/s With what speed does your image appear to be moving away from you?

Homework Statement A trucker sees the image of a car passing her truck in her diverging rear view mirror whose focal length is -60cm. If the car is 1.5m high and 6.0m away, what is the size and location of the image? Homework Equations 1/f = 1/di + 1/do The Attempt at a...

Hi! The diagram below shows two mirrors X and Y, and a solid object with white spots at P and Q. http://img199.imageshack.us/img199/9284/unbenanntcwz.jpg An observer at A sees an image of P reflected in mirror Y. Mark R, the position of this image, and draw a ray from P to the...

I know that mirror symmetry resulting in mirror matter and supersymmetry resulting in SUSY partners are two completely distinct fields, and that the original bosonic string theory needs SUSY to get fermions. If mirror matter does exist in the universe, what would this mean in terms of SUSY...

Homework Statement a plane electromagnetic wave of intensity 6.00 W/m^2, moving in the x direction, strikes a small pocket mirror of area 40.0cm^2, held in the yz plane. (a) what momentum does the wave transfer to the mirror each second? (b) find the force that the wave exerted on the...

Mirror equation help! please urgent! Homework Statement The distance from the lens of someone's eye to the retina is 20.0 mm. if the image of a book held 40.0 cm is in front of the eye in sharp focus, what is the effective focal length of the lense. the back of the book says the answer is...

When designing a space based energy satellite for our project, we ran across the option to just use a mirror to reflect extra light to a photovoltaic ground station on earth. The main difficulty of this option is that due to the fact that the light coming from the south pole of the sun hits the...

Hi, I just ordered my first primary mirror (10") for DOB from Coulter Optics. I want to test it after it arrives. Does anyone has expirience with testing/checking params for parabolic mirrors? Clear skies!

1. Light from a distant star is collected by a concave mirror. How far from the mirror is the image of the star if the radius of curvature is 150 cm? 2. 1/f = 1/do + 1/di 3. 1/f = 1/do + 1/di f = 150/2 = 75 cm di = dof/do - f = do(75)/do- 75...

Homework Statement An object is placed 15cm from a certain mirror, the image is half the size of the object, upright, and virtual. how far is the image fromt he mirror, and what is the radius of curavature of the mirror? Homework Equations 1/f = 1/p + 1/q f= r/2 The Attempt at a...

Convex mirror problem help?? Homework Statement a convex mirror has a focal length of 75cm. an object with a height of 2.0m is 6.0m from the mirror. a) what is the distance from the object's virtual image to the mirror? b) what is the height of the object's image? Homework Equations...

Homework Statement A concave mirror with a focal length of 34.4 cm produces an image whose distance from the mirror is one-third the object distance. Calculate the object distance. Homework Equations (1/f)=(1/do) + (1/di) The Attempt at a Solution I know that i have to use the...