Mirror Definition and 656 Threads

Hi everyone! I'm wondering if there is a one-way mirror that works like the one illustrated in the image below: I know that most one way mirrors work differently, reflecting light from the brightest side and letting light through to the dark side. Is it possible for a mirror to let light...

I am now taking optics class at my school. Fermat principle can be applied on mirror of course. Then what about Concave mirror? According to the calculus of variation. the optimized path(actual path of the light) should be the shortest path. but in the concave mirror case, it goes through the...

Follow up a former thread, about concentric halo`s around the eyes, in a foggy bathroom mirror. I made an example picture of what was observed. But i don't know what causes the phenomena

there is considerable research interest in supersymmetry, both for string theory and particle physics.What would be the implications to physics if parity symmetry is a fundamental symmetry, and therefore mirror matter and mirror bosons exist? would this imply mirror matter has all same exact...

Homework Statement I think this is a 'magnetic mirror' question - the field lines converge on the z axis. For a particle moving into an area of increasing field strength, where the field lines converge. Assume the ##B## field is rotationally symmetric about the ##z## axis, with ##B = B_z...

These seems like an easy question, but I have found nothing online: Does the size and distance of the virtual image produced by an off-axis parabolic mirror vary as a function of the off-axis angle, or will it be the same as the parent parabola? Specifically, I am trying to create a simple...

To grow food in space, I have read about two designs of greenhouse. One is a pressurised greenhouse with wide expanses of thickened glass. The other is indoor stacks of shelves with LEDs driven from solar PVs outside. But would this third design work? Have a rotating mirror to focus light into...

Homework Statement ##d=0.52 cm,## ##\lambda=431nm##, ##L=119 m## Homework Equations ##dsin\theta=(m+1/2)\lambda## for constructive/bright fringes since there is a pi shift already The Attempt at a Solution a) $$sin\theta\leq1$$ $$(.0052/431e-9)-0.5=m=12064$$ 2 \e{3} $$ total bright fringes =...

I keep reading the general opinion that the improvement is just not worth the risk if you attempt to clean the mirror on a Newtonian. Clearly, there must be a point at which it really is an important thing to do. I thought I would try a back of fag packet calculation and see where it took me...

Compton hit the electrons in a carbon target with x-rays and measured the changes in the wavelengths of the scattered photons versus their deflected angle. He correlated that with the energy and momentum the incident photon gave to the electron. My question is why does this not happen in...

Consider an upright cylindrical concave mirror with a point source located at the focal point of the mirror. By upright I mean that the mirror is plane in the vertical direction and a concavity in the horizontal plane. Now it seems likely that you would see a virtual image of the point source...

Just a thought...I know it is impossible, but... What would you see in a mirror if you set up millions of mirrors, each reflected to the next mirror (each not too far apart), maybe in a spiral format, so that the total distance of reflections was one light year. The last mirror was angled to...

Homework Statement An object is at a very large distance from a concave mirror of focal length 40cm. Find the distance from the image to the mirror. Is the image real or virtual? Homework Equations 1/u + 1/v = 1/f The Attempt at a Solution [/B] 1/u + 1/v = 1/40 The image has to be real...

Mirror/camera/TV etc. don't have a complex visual cortex system/perception like our eyes. Human eyes use rod,cone,neuron and above all perception of brain to make image. How come these devices create the same clear images/scenes at their surfaces by themselves without having the advance...

Homework Statement Consider an infinite sheet of magnetized tape in the x-z plane with a nonuniform periodic magnetization M = cos(2πx/λ), where λ/2 is the distance between the north and south poles of the magnetization along the x-axis. The region outside the tape is a vacuum with no currents...

Hello. Today I used a magnifying glass and observed how it converged sun light to a smaller area. The smaller the area and the more violet was the light diffused by the surface. Why does this happen? Then I used a mirror hoping the small violet point would be reflected, but it didn't happen...

1) If the angle of incidence of a ray of light to mirror is 50 degrees, what is the angle of reflection from the mirror? 2) If the angle of incidence of a ray of light to a mirror is 20 degrees, what angle does the light ray make with the mirror when it reflects? 3) If a ray of light makes an...

1. Homework Statement A convex spherical mirror with a focal length of magnitude 25 cm has a 4.0-cm tall flower placed 100 cm in front of it. What is the height of the image of the flower? a.20 cm b. 1.6 cm c .0.80 cm d. 4.0 cm e. 8.0 cm Homework Equations 1/f=1/do+1/di M=-di/do=hi/ho The...

If we take a mirror plane mirror circular and make it to setup with a high speed motor and make it to rotate at a speed of 5000 rpm and more ..what would be the image formed on the miroor if an object is made to be placed. Give me better answer...i don't know [emoji17] [emoji17] [emoji17]

I'm supposed to be working with a CMA (Cylindrical Mirror Analyzer), but I'm more interested in the physics behind it. This is the instrument in question that we are looking to get: http://www.rbdinstruments.com/products/micro-cma.html We want it to look at different eV levels of different...

I was examining the insides of my 8" Dobsonian with my new Red Led torch last night and the mirror was looking decidedly dusty. What's the solution to that? A long fluffy duster on a stick? (With care, of course.) I am now thinking that it's probably best to store the scope with the tube...

A plane mirror forms a virtual image of a real object placed in front of it and a real image of a virtual object placed in front of it. I can't picture the second case. Please show me a ray diagram showing real image formation by a plane mirror or just explain the case of real image formation by...

Hi. I'm trying to proof the image formation property of a concave spherical mirror. I know you can do this easily with a particular choice of rays (namely one that hits the vertex and one that passes through the center of the sphere) but I would like to show that a generic ray yields the same...

Homework Statement An object gets closer to the plain mirror with a speed v. With which speed does it get closer to the reflection? Homework Equations l=v*t The Attempt at a Solution As l (length of road) is twice as big l2=2l1, but the time is equal t1=t2, then velocity should be two times...

Homework Statement A convex lens which focus point is 10 cm is placed face-to-face with plane/flat mirror in a 20 cm distance. If a candle is placed 5 cm in front of the plane mirror which will get reflected by the mirror and refracted by the lens, so the distance between two first image in...

I have drawn a diagram of the incident and reflected rays of an object by the concave mirror. Red color shows the incident rays, black color shows the normals drawn from the center of curvature, while green color shows the reflected rays. Shouldn't all the reflected rays meet at one point. Any...

Homework Statement An object is placed a distance do in front of a concave mirror with a radius of curvature r = 6 cm. The image formed has a magnification of M = 4.3. Solve for the object's distance. Homework Equations M = -di/do (1/do) + (1/di) = 2/R = 1/f The Attempt at a Solution I've tried...

I'm constructing a backscatter optical setup for my thesis and I'm trying to find something like a pellicle mirror (or pellicle beamsplitter) that is transparent to light from one side but reflects from the other side. I can use a conventional pellicle beamsplitter, however since my...

Suppose we have a photon fired at a half-silvered mirror. There is a 50% chance that the photon reflects, and a 50% chance it passes through, right? Suppose there are two detectors, one that only detects reflected photons and one that detects only passed photons. So my question is: does the...

I purchased a 6 inch mirror reflector telescope with GPS tracking, and hoping to do some astrophotography. I previously had a 3in lens refractor. Will the resolution be twice as good?

Hello! I've read on several pages that plane mirrors have an infinite amount of focal points. I don't understand? I thought plane mirrors have no focal points because the rays are parallel and don't focus in the first place. Why does a plane mirror have infinity focal points and what does it mean?

Hello everyone, We are trying to fabricate a copper layer that is 41% reflective to a beam of 1521nm wavelength. The formula I have used to calculate the thickness is: R = 1 - e-αt Where R: desired reflectance of mirror t: thickness of mirror that would produce said reflectance α...

Homework Statement A glass block of thickness 60 cm and refractive index 4/3 is placed in front of a concave mirror. A light source is then placed on the center of curvature of the concave mirror. Find the position of the final image formed. (Focal length is 30 cm) Homework Equations...

Homework Statement A plane mirror of length 20 cm is put up in a wall.The upper part of the mirror is 130 cm above the ground.A person is standing 1 m in front of the mirror.The person's eye is 130 cm from the ground.Suddenly,the mirror falls.How long is the person able to see the tip of his...

Which is correct? It's almost split 50/50 when I search online. Do the particles trapped in a magnetic bottle travel around the magnetic field or around each magnetic field line? It makes more sense for them to travel around the field because the field is what changes in density not each line...

Hi , I came across a problem ,I've search a lot but couldn't exactly find the solution. here is my problem: suppose there is an image ( I call it IMG_A),place IMG_A in the X-Y plane , put a mirror cylinder at the center of IMG_A. what we see in the cylinder mirror is a deform image (I call it...

Let's say you have 2 100% efficient reflective surfaces exactly parallel to each other. If you theoretically managed to place photons at exactly 90° angle of incidence. So this beam of visible light (and I want to stress that) is going to stay there as long as there is no interaction, the beam...

Consider a system with a mirror axis (bulk projected surface), I want to know the direction of spin polarization on the mirror axis. The result is that the spin is perpendicular to the mirror axis, but I don't understand the reason. If someone have related references, please recommend to me...

So I've been thinking about how the magnetic fields from the Earth create a magnetic mirror which accelerates the the particles in the atmosphere causing them to ionize and thus produce the auroras we see. But it is curious to me that they can only be seen in the upper most northern and southern...

Hi all, I was hoping you could help me out with this one. Im trying to calculate the redshift or blueshift of a photon that strikes a mirror and reflects. I know E=pc, and that 2p is the momentum transfer. I also know that kinetic energy is 2p/M (of the mirror). However, this says that...

Hi, In (1+1)D Minkowski spacetime, with coordinates (t,x), let's say there is an incoming plane wave of frequency \omega, \phi_{in}(t,x)=e^{-i\omega (t+x)}. There is a mirror, x=z(t) It reflects the incoming plane wave and emits an outgoing plane wave. Question: why is the outgoing wave...

while a simple concave mirror projection does not?Hi, I'm really not sure where does this question go, but perhaps this is as good a place as any... If not, then I would appreciate a referring to the right place. So, I have encountered this nifty, decades old, illusion created by combining two...

The lens and mirror in the figure below are separated by d = 1.00 m and have focal lengths of +77.9 cm and -59.0 cm, respectively. An object is placed p = 1.00 m to the left of the lens as shown. i need to find the final object distance and have no idea what am i doing wrong. I am just using the...

Mentor's note: This thread has been split from https://www.physicsforums.com/threads/double-slit-with-semi-transparence.845980 What about if the wall were not transparent but one of the slits equiped with a half transparent mirror ? Then we would half-know which path was taken hence we should...

Hi, Concerning optical polarization, what is the Jones Matrix of a mirror at a non-zero angle of incidence with respect to incoming light? For a mirror at normal incidence the matrix is (1 0; 0 -1); How do I incorporate the angle?

Homework Statement A real object is put in-between a convex lens (f = 30.0cm) and a plane mirror as shown in the figure below. Two images of the object are observed : a real image 50.0cm to the left of the lens and a virtual image to the right of the lens. The size of the virtual image is 3.00...

Homework Statement The mirror in the image below deflects a horizontal laser by angle θ. What is the angle φ if θ = 60°. Homework Equations θi=θr The Attempt at a Solution So I know that, if I draw a line normal to the mirror, that will make it so that the incident angle and the reflected...

Hello all, I've got a question, obviously. I've got a light shining down from directly up above think laser, I want to reflect the light to hit the wall, redirect it 90 degrees. What angle would the mirror need to be to do this? For some reason I'm thinking 45 degrees. Thanks, Kevin S. Chambers

I've searched high and low for answers to this, and a friend of mine finally pointed me in the right direction. I decided to write a post about it so hopefully others who have the same question will find the answer more easily. When linearly polarized light is reflected at a 3D angle, the...

the question in my exam goes like this: should we use a thick convex mirror or a thin one for the anti-theft mirror? the given answer: thin, because a thin convex mirror does not form multiple images can someone please explain to me why a thin spherical mirror does not form multiple images...