Questions tagged [reflection]

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1answer
14 views

X and Y profile of a round object using a 45degree mirror (why is the Y profile smaller)

I'm trying to measure the X and Y profiles of a round object using a single camera. The camera has a direct view of the object in the X profile but sees the Y profile of the object as a reflection on ...
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Total electric field

Given a plane wave with the electric field component $$ \tilde{E}_{in} = E_0(-\hat{x} \cos \theta + \hat{z}\sin \theta)\exp [ i \frac{\omega}{c}(x \sin \theta + z \cos \theta) - i \omega t]$$ I've ...
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1answer
21 views

EM Wave Reflection and Transmission Between with Anti-Reflective Coating

I am trying to solve a problem in which light is normally incident on a material of refractive index n which is coated with an anti-reflective coating of refractive index $n^{\frac 1 2}$ and thickness ...
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How do you get the conductivity of a material from its reflectivity? [closed]

I'm trying to find out how to get the conductivity when I have data from a reflection measurement. I know it also depends on the s and p polarization. I have been reading several papers but I can't ...
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1answer
31 views

Is there a connection between partial reflection and formation of virtual image?

If light rays do not intersect, there won't be any photons, but if we can see a virtual image there should be a source. Is there then a partial reflection connected to this?
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Why can a transmission coefficient between strings be bigger than $1$?

Suppose two semi-infinite, one dimensional, classical strings are connected at $x=0$, each with wave velocity $c_1,c_2$ and equal tension. $c_1$ corresponds to the velocity on the left, and $c_2$ on ...
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2answers
22 views

Laser triangulation via mirror

if I use a triangulation sensor and put a perferctly flat mirror in front of it (45°), will the measured distance be the same as without a mirror?
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1answer
52 views

Can I simulate distance using a series of mirrors? The ray diagrams for this is driving me crazy!

I went to my Optometrist yesterday, and I noticed that they wanted to test my vision at 20ft. However, because they had a small room that could only accommodate 10ft, they used a vision chart that was ...
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2answers
70 views

Are two lights waves that are out of phase mirror images?

Is light shifted 180 degrees out of phase, when it is reflected off a mirror? When light is shifted 180 degrees out of phase, is it the mirror image of the light wave?
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How to calculate the Jones vector in the following setting

Calculate the refractive index of gold at a wavelength of $632.8$ nm using the simplified Drude model for metals. Assume linearly polarized light at $45$° that is incident at an angle of $80$° on a ...
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Real image by concave mirror or convex lens

My question is how exactly can we 'see' the real image ON the mirror or lens without a screen? Also if a screen is placed, for example a real image by concave mirror has formed in front of the mirror ...
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0answers
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What makes a point on path of reflected light (while forming image) visible?

The path of light is not visible in vaccum,but only the source(reflecting surface) of light is visible to us. But in case of image formation, for example from a concave mirror, we see the image at ...
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Why image gets formed when light rays intersect? [duplicate]

When an object reflects light and if it enters our eye, our brain interprets the light and make us see the point of reflection i.e., the object. But in case of image formation , the intersection of ...
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5answers
138 views

Why does the brain interpret light from a mirror the way it does? [closed]

When we place an object above mirror and viewed from side, we see the image to be below the object, as if the reflected light is coming from inside the mirror. From the image above, the light from top ...
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1answer
40 views

Cavity Radiation, why should only standing waves persist in the cavity?

"Because when the box is in thermal equilibrium, there can never be any electric field at the walls for it would shake the charge in the wall around, changing the temperature, contradicting the ...
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0answers
51 views

dynamic understanding of waves on string

I am a high school student and I am very confused in reflection of waves on string. My confusion is : when a transverse pulse on string reaches a rigid end, how is the reflected pulse inverted in ...
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1answer
19 views

Confusion about boundary conditions for reflection of light

The reflection at a dielectric interface was analysed in Griffiths introduction to electrodynamics using the following diagram. I do not understand why the direction of $\vec E_r$ and $\vec B_r$ are ...
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1answer
27 views

Is a reflected wave on a string of the same form as of the incident

Griffiths says that if a incident sinusoidal wave on a string gets reflected, it's form will be sinusoidal as well. Why is it so? Does it hold for all wave forms in any medium?
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Should I canculate the instantaneous velocity of average velocity for the question?

A man running at a speed 5m/s is viewed in the side mirror of radius of curvature R=2m of a stationary car. Calculate the speed of image when the man is at a distance of 9m from the mirror.
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1answer
29 views

How do we define phase difference between waves travelling in opposite directions?

The wikipedia page says that sound waves when reflected at a solid surface show no phase change, but when reflected from a region with lower acoustic impedance, they exhibit a $180^\circ$ phase change....
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2answers
25 views

Contradiction in phase of reflected longitudinal waves

While studying the fundamentals of sound waves in organ pipe, I noted that the fact about phase of reflected waves is contradicting while referring multiple sources This book of mine describes the ...
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3answers
36 views

If image formed by a plane mirror is virtual, then how are we able to capture that in a camera?

What I have learnt in school is that, we are able to see images behind a mirror(virtual image) because our brain assumes that the diverging rays that our eyes see, are coming from a point behind the ...
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0answers
23 views

What would it look like inside a spherical mirrored room?

What would it look like if you were inside a perfectly spherical "room" that was completely mirrored (seamless) with a small, single source of light? Previously I'd wondered/theorized about ...
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1answer
24 views

Normal lying inside the mirror surface

In the problem above what does the question means by given normal lying inside the mirror surface? Is it has something to do that they have i and j components same. I also wanted to know what does the ...
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3answers
75 views

Does $s/p$-polarized light remain $ s/p$-polarized after reflection?

Suppose you have a beam of $s$-polarized light that reflects off of some medium. Is the reflected beam also $s$-polarized? What about with $p$-polarization? I'm assuming those nice properties of media ...
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1answer
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When (visible) light waves get reflected, why are the incident ray, reflected ray and normal coplanar?

I was told that when a wave of visible light is reflected (or refracted) then the incident ray, the normal to the reflective surface (or interface of two optical media) and the reflected and refracted ...
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1answer
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How many images will I see if I am surrounded by 4 mirrors?

An image question got me today when I was reviewing image theory. With 1 mirror -- I see 1 image out of phase of myself. With 2 parallel mirrors, me being between them -- I see infinite images of ...
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3answers
372 views

Can we lock the light (photons) up inside a box? Why / Why not? [duplicate]

Imagine a box designed to make vacuum state inside. Is it possible for us to lock the photons up inside something completely enclosed?
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1answer
50 views

Will the sky be full of rainbows?

I saw this article and something really wierd came in my mind. What would the sky look like on those planets of our solar system where rainfall of diamonds occur? Will it be full of rainbows? Has it ...
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3answers
305 views

Colour patterns from the reflection of my window

The first picture is that of my window while the second is its reflection as seen from the floor. The pattern depends on the angle. That is when I move a little closer then look at the reflection the ...
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2answers
46 views

Dispersion in Rainbows

So I have tried searching for the working of a rainbow. I found many sources and the explanation was clear. I still have a problem though. Since dispersion happens due to different refractive indices ...
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0answers
23 views

What is the difference between direct reflection and ambient reflection?

I am not in Physics major, and I wanted to know what is the difference between these two: direct light reflected for the first time (like an object reflecting the light coming from the sun). ambient ...
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1answer
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How does longer length of optical path in binoculars increase its magnifying power?

I just read about Prism Binoculars from my high school physics textbook. However, I am not able to understand how does increasing the distance light travels from the objective lens to eyepiece can ...
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1answer
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About reflections between two mirrors, can the reflection be prevented from getting smaller using a bulging shape?

I was reading this answer: https://physics.stackexchange.com/a/346489/230132 It seems its author ceased to visit SE since April so they will probably never answer my comment. So I am asking a question ...
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1answer
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Reflectivity coefficients at dielectric interface

In the book Principles of Lasers by Orazio Svelto, at chapter 4.3 "Wave Reflection and Transmission at a Dielectric Interface", the author tells that If the wave is initially in the medium ...
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1answer
21 views

Calculate if a beam of light will pass through a given point?

I'm not sure this should be in math or physics so i'm asking in both. Given a laser beam at closed reflective surface where point $(x,y)$ being the source of a laser bean which hits a reflective ...
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1answer
45 views

Why mirrors are not used in optic fibres?

In optical fibres we reflect light by the use of total internal reflection (TIR). I know there will be some energy loss in optical fibres if we use mirrors but why there isn't significant loss in TIR? ...
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1answer
18 views

Why the transmitted pulse in pulse-echo technique cannot be too long?

Question. An ultrasound pulse-echo technique is used to produce an image by reflection from many boundaries. If the transmitted pulse is too long, the image produced is of poor quality. Why? My ...
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4answers
51 views

Is total internal reflection just a simple reflection?

We all know that when light hits a plane surface, it reflects back. And when the light hits plane surface, then if incident angle is greater then critical angle then it reflects back into the medium, ...
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2answers
139 views

Why does metal change its color under polarized light?

I've taken two photos of a metal in an experimental setup. The first image shows the metal illuminated by a halogen-lamp from above. The second image shows the same metal illuminated by the same lamp ...
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1answer
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Will a sheet of carbon atoms reflect radio waves?

I am working out some details in a SciFi novel. I'm thinking of having spec ops who would use a device that could manipulate carbon atoms to form and maintain large, rigid, one-atom thick carbon ...
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0answers
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What is the radar cross-section of a Romanesco broccoli?

The Romanesco broccoli is an interesting vegetable that exhibits a fractal pattern on its surface : Image link Regarding physics, I was wondering what is the radar cross-section of this pattern ? Can ...
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3answers
45 views

Since radiation loses energy to radiation pressure in a reflection, can the entire energy of a radiation be consumed through multiple reflections?

Parent question here: Do photons lose energy after radiation pressure is applied to a perfect reflector? So I have been told that radiation pressure that sets a mirror in motion (e.g. in outer space) ...
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1answer
35 views

Wondering about angle of incidence [closed]

Hi I was wondering if someone could help me please find the angle of incidence of light passing through a glass slab with a refractive index of 1.52 and undergoing one TIR at an angle of 42 and ...
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1answer
54 views

Amount of heat emitted from the Sun by radiation

Supposing that the condition of humidity and the temperature are the same. Concretely if in one place on Earth there is the same humidity, temperature, it is more hot in the first part of the summer ...
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6answers
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Why can I see the top of objects in a reflection when they are not facing the reflective surface?

Why am I able to see the top of the pictures even though they aren’t facing the reflexive surface. The light would have to travel down through the picture
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4answers
236 views

Should we trust quantum mechanics for working of the mirrors?

In this video, it is explained that it is not necessary that photons obey the laws of reflection and each photon can take any possible path to reach the so-called black hole receiver and all the paths ...
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0answers
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How could we see the image of ourselves in concave mirrors?

Let's consider a case where observer AB (let's suppose 'you') are standing on the radius of curvature of a concave mirror . The point A is your eye (as shown in the figure) and with the help of the ...
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2answers
150 views

Doubt regarding mirrors

This question of mine is regarding some general observation. From ray diagrams it can easily be concluded that using a real object, we cannot get a real image from a plane mirror. But, if we shine a ...
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1answer
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Minimum length of full-length mirror - can anyone explain? [closed]

this example by the answer but I don't understand the steps. So please if you understand or have another steps drop it . Thanks

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