Mirror Definition and 656 Threads

By seeing the way light is bent when passing close to massive objects, like Einstein's cross, I was wondering would it be possible for light to be bent so much, it would swung by the other side, similar to gravity assist maneuvers, and come back in an almost parallel direction, towards its...

What is the formula for mirrors and lenses? My textbook says 1/f = 1/ do + 1/di Then, hi/ho = - di/do Then, M= hi/ho M = di/do Why is that that M equals each other, but one di/do is negative and the other isn't?? Is the formula my in textbook wrong? Also for questions the textbook gives...

I was wondering whether the curved surface mirror formula (that is usually used to solve convex or concave spherical mirror problems) remains unaltered in case of parabolic mirrors.What might be invalid is the equation 1/f= 2/R... After all,the equation 1/v + 1/u= 1/f pertains to...

Homework Statement A 18g rubber stopper is suspended by a 45-cm string from the rear view mirror of a car. As the car accelerates eastward, the string makes an angle of 5.1 degrees with the vertical. Determine the acceleration of the car. Homework Equations The Attempt at a...

I'm having difficulty understanding how to estimate the location of an image in a lens/mirror. I tried understanding it by going off the books question/answer section: "A spherical concave lens has a focal length of 16 cm, and an object is placed 8 cm from the lens." It says the answer is...

Homework Statement A laser beam is incident on the left mirror in the figure below, in which α = 85°. Its initial direction is parallel to a line that bisects the mirrors. What is the angle ϕ of the reflected laser beam? http://www.webassign.net/knight/p23-40.gif" Homework Equations...

Homework Statement I can't seem to figure out whether I'm dealing with a + or - radius value. Anyways here's the question: An object 5.0 cm tall produces an image that is 7.0 cm behind the mirror. If the radius of the curvature of this mirror is 10.0 cm, what is the magnification of the...

A concave astronomical telescope mirror may be made by rotating a circular tank of mercury. Find an expression for the shape of the surface in terms of the density of mercury, the radius from the centre and the rotaion rate so far I've come up with: KE=1/2MV^2 In the case of circular...

A lot has been written about the relative merits of decoherence versus the many-worlds theory in answering the question: where does the extra information go when a superposed state "collapses" to a definite state. However, what about the reverse: when the definite state returns to a new...

suppose if you can travel at the speed of light. and you travel at the speed of light and look in the mirror can you see yourself in the mirror? people say you can but no one bothered to give me a explanation or they are just wrong i have no clue

How come when light hits a mirror and then gets re-emitted , that the light comes off at the same angle it hits, when the light hits the glass or what-ever , when it interacts with the electrons in the atom , these electrons are orbiting so why can't they re-emit the light at some other angle .

Homework Statement Sunlight falls on a concave mirror and forms an image 3.0 cm from the mirror. If an object 24 mm high is placed 12.0 cm from the mirror, where will its image be formed? a. Use a ray diagram b. Use the lens/ mirror equation c. How high is the image? Homework Equations...

Parabola for 18" aluminum mirror Help; need to configure inputs into parabola formula to machine an 18" dia., 1.5"h aluminum disc. for use as primary objective mirror in telescope.

Homework Statement You put a point source of light (S) a distance (d) in front of screen (A). How is the light intensity at the center of the screen changed if you put a completely reflecting mirror (M) a distance (d) behind the source? M-----d-----S-----d-----A Homework Equations...

Homework Statement The virtual image produced by a convex mirror is one-quarter the size of the object. b) What is the focal length of this mirror? Homework Equations 1/di = 1/f - 1/do The Attempt at a Solution i found di to be -9.3 cm but when i solved for f i keep getting it...

Homework Statement You are 1.9 m tall and stand 3.5 m from a plane mirror that extends vertically upward from the floor. On the floor 1.5 m in front of the mirror is a small table, 0.80 m high. a) What is the minimum height the mirror must have for you to be able to see the top of the...

Homework Statement A convex spherical mirror has a radius of curvature R = 20.0 cm and produces an upright image precisely one-quarter the size of an object. Calculate the separation distance between the object and its image? Homework Equations M = (image height)/(object height)...

A 6ft tall man stands in front of a mirror (2ft tall) The mirror is 5ft away from the man and 4 ft above the ground. How much of his image can he see? A 6ft tall man stands in front of a mirror (2ft tall) The mirror is 10 ft away from the man and 4 ft above the ground. How much of his...

Homework Statement A plane mirror is moving at a uniform speed v away from the observer and a pulsing source of light of frequency f_0. What is the frequency of the light reflected in the mirror as seen by the observer? This isn't an actual homework question but I have a similar...

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 At an intersection of hospital hallways, a convex mirror is mounted high on a wall to help people avoid collisions. The mirror has a radius of curvature of 0.510 m. -What is the image distance for a patient 11.9 m from the mirror? (Use the correct sign conventions.)...

Homework Statement In the attached picture , It has been explained in my book that " I 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 ! Plzzzz help!

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...

Just wondering: I know that your mirror-neurons strengthen connections simply by watching someone perform an action. My question is, is muscle memory tied to mirror neurons? Or is this not yet known? Can you gain muscle memory simply by thinking about a certain motion, rather than...

[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...