Questions tagged [reflection]

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2
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1answer
114 views

Light reflection from a charged surface

Will we see differences (in intensity or spectrum) of visible light reflection from surface of positively versus negatively charged metal plate (or any non-conducting materials)? Are there data about ...
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28answers
118k views

Why are mirror images flipped horizontally but not vertically?

Why is it that when you look in the mirror left and right directions appear flipped, but not the up and down?
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0answers
25 views

How can I see my REAL IMAGE which is formed behind me, in the CONCAVE MIRROR when I am standing between CENTRE of CURVATURE AND FOCUS [duplicate]

In the first image suppose that I am the observer standing between the focus and the center of curvature of the concave mirror.so my real image is formed behind me (in the air). So If the real image ...
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1answer
323 views

Reflection of Electromagnetic wave

I have a question that I have found the solution to but does not match with the answer given, here goes the question, A plane electromagnetic wave propagating in air with $ \vec{E} = (8\hat{i} + 6\hat{...
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2answers
546 views

For the derivation of the form of a paraboloidal reflector, there is much more in need as just Fermats principle?

I am currently learning about Optics using an MIT OpenCourseWare Course. I have in particular a question about the application of Fermat's principle in Lecture 3, i.e. deriving the shapes of parabolic ...
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0answers
14 views

Sign of reflection coefficient $E_r/E_i$ at normal incidence! [duplicate]

At normal incidence the plane of incidence is not defined! So how do we will understand that whether the reflection coefficient is positive or negative; because according to frensel equation for E ...
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1answer
138 views

How to calculate bounce angle of disk from an edge

What I am looking for is how to determine the bounce vector of a disc hitting the edge of an object. The disc can be at any angle to the edge. I have a program that does the calculation without ...
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2answers
42 views

Apparent depth WITH viewing angle [closed]

So i did one physics problem where I should find apparent depth of 3m deep pool(index between liquid in pool and air is (√7)/2) and we are looking at pool from 30° angle. I go to our favorite friend ...
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2answers
759 views

Radio wave behaviour in reflection, Refraction and Diffraction

I am trying to understand how radio waves behave when reflected, refracted and diffracted. I have put together a list based on light which I think will be the same. Can anyone tell me the behaviour of ...
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1answer
160 views

Mirror symmetry of spin-1/2 wavefunction: Definition of the reflection operator

I would expect from a reflection operator $\hat{M}$ to leave a wavefunction unchanged if two times applied, thus $\hat{M}^2=1$. However, for a spin-1/2 particle this is not the case when following the ...
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0answers
16 views

Clarifications about Lambert's law

I do not understand some things about the Lambert's emission law. Let's consider this text (reference): There is a common pattern to the angular distribution escaping light from certain diffuse ...
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1answer
26 views

How to see the image of an object in the mirror from another position?

Say I have a large mirror and in front of the mirror, there is an object and I'm standing at a different position in front the mirror. At what position should I look in the mirror so that I can see ...
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0answers
17 views

Image method for room impulse response simulation

I am following this paper on simulating a room impulse response (RIR). The wave of a single frequency $\omega$ point sound source in location $X$ as it is viewed by a microphone located at $X'$ is: $$...
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0answers
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If at $t=0$, electromagnetic radiation was fed into the reflecting enclosure, how will the energy density within the Sphere change with time?

There is a Sphere which is $100\text{%}$ reflective by inside. And the radius of the sphere is increasing monotonically with time as $a(t)$. If at $t=0$, electromagnetic radiation was fed into the ...
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0answers
39 views

Intuitive explanation for the Fresnel effect?

I've spent some time researching the Fresnel effect as part of learning how to make shaders and, although I got how it works and how to calculate it, I haven't been able to figure out why it works. ...
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1answer
39 views

Why do reflection gratings work?

The law of reflection (that the angles of incidence and reflection are equal) can be derived directly from Maxwell's equations, or from Fermat's principle. However, reflection gratings completely defy ...
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3answers
2k views

Reflection coefficient as a function of frequency

I am trying to relate the equation for reflection coefficient in oblique mediums to the frequency but can't figure out how the frequency affects the reflection of light. $n_1$= intrinsic impedance of ...
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2answers
5k views

Does refraction take place in plane mirror?

I have read that reflection and refraction both occur simultaneously. My question is, does refraction also take place in plane mirror or is there only reflection?Why or why not?
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1answer
56 views

Does light reflect from silver because of the difference in refractive index?

In a discussion with a friend, he seemed to be saying that reflection of light happens because of the difference in refractive index between two media, implying that that is the only reason reflection ...
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2answers
52 views

Does a smaller reflective box filled with trapped photons make the box heavier?

In Leonard Susskind's video lecture on the Higgs Boson, he uses a model of a box made from very light, very reflective material containing photons, explaining how in this way, for example, the proton ...
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1answer
41 views

What would happen to the Sun if you reflect all the light back?

What would happen to the Sun if you reflect all the light back with mirrors?
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1answer
253 views

Explanation for possible interference on a home mirror?

I've noticed that a few peculiar things about home commercial mirrors that aren't present with industrial/scientific mirrors. This is one of the mirrors I used. With the mirror like the one above, ...
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0answers
32 views

Why do waves reflect in phase off of soft boundaries?

Based on Newton's third law of motion I understand how waves reflect pi out of phase off of hard boundaries (see gif 1), but what would be the reasoning as to why waves reflect in phase off of free ...
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1answer
26 views

Incongruence in virtual image position on a convex parabolic mirror

I'm pretty new to the subject of geometric optics so forgive me if what I'm asking has a trivial explanation. I was trying to find the position of the virtual image of a point object on a convex ...
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0answers
28 views

How to calculate the radiation pressure on a moving surface?

How do I find the radiation pressure exerted on a perfectly reflective flat surface that is moving along the normal of the mirror?
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3answers
38 views

Why is an image formed where the direction of incident ray meets?

Why is an image formed where the direction of incident ray meets?For example:If a light ray is incident on a plane mirror , the ray will partly reflect and refract.Now the position where the direction ...
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0answers
17 views

Snell law for low refractive index materials

I was reading on my lectures slides what will happen if there if there is an incident ray on the interface between air and a lower refractive index medium (it is a special case which exists only in ...
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1answer
27 views

How can one eliminate/minimize water wave reflections in a ripple tank?

Is there any way to prevent or minimize reflections of water waves in something like a ripple tank? I'm thinking maybe something analogous to acoustic sound panels (I believe they use foam properties ...
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1answer
11 views

How to calculate the reflection efficiency for an antenna? [closed]

I want to calculate the reflection efficiency of a transmitting monopole antenna which is connected to a 50 ohm lossless transmission line. And I know that the input impedance of a monopole antenna is ...
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1answer
202 views

Sign Conventions in Mirror/Lens formula

All textbooks I've come across have the same way of proving the mirror formula. Everything makes sense, except the fact that they apply the sign convention once to obtain the mirror/lens formula, but ...
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1answer
23 views

How do we see an image if converges behind us?

Say we have a concave mirror which is converging light rays from you at a distance $v$ from the mirror where $v>u$. ($u$ is the distance of you from the mirror). So if the light is converging ...
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2answers
2k views

Should a superconductor act as a perfect mirror?

I have been told that metals are good reflectors because they are good conductors. Since an electric field in conductors cause the electrons to move until they cancel out the field, there really can'...
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0answers
62 views

Does level of pollution determine if a rainbow will be formed? [closed]

Today I saw a rainbow after almost a decade. I live in Noida (a city) in India. Most people I know believe that: we don't see rainbows nowadays because of pollution and now after nearly 3 months since ...
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1answer
65 views

How pure are the colors of the rainbow?

I just watched this lecture on rainbows https://www.youtube.com/watch?v=iKUSWJWMSk4 and in it I found out that the colors in the rainbow are not monochromatic. At any point in a rainbow there is a ...
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1answer
52 views

Is it possible to achieve Invisibilty? [closed]

I read that mirrors absorb only a small amount of light(1-2%). And recently MIT engineers developed the "Blackest Black"(blacker than Vantablack) which reflects only 0.005% of the light. Let's say we ...
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1answer
125 views

Partial single photon reflection

If I understood Feynman correctly, a single photon reflects with a chance determined by the added amplitude arrows of each surface it encounters. I'd still like to know how that is determined if the ...
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1answer
23 views

Low frequency square wave into a parabolic reflector

Imagine a perfect audio speaker creating a planar square wave - driven into a parabolic reflector. The fundamental wavelength is around twice as wide than the parabolic reflectors diameter. I've read ...
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1answer
585 views

Under water light reflection of air in a cup vs water in a cup

The last time I was on vacation I was drinking on the swimming pool, and after I was finished with the drinks I started playing with the 2 plastic cups I had, and noticed that the air produces a ...
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1answer
28 views

Optics - Object between two “parallel plane mirrors”

The problem is the question 5.67 of Hecht book - Optics Suppose two mirrors (A and B) are 25 cm apart and a small candle is placed in between them such that you cannot see it. You see the images at $...
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1answer
51 views

Burning Space Mirror Farm

Physicists at MIT have created the first perfect mirror. If this is true, could enough mirrors be directed at a space ship like Archimedes "Burning Mirror" would at a boat from automated solar farm in ...
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1answer
11 views

Which materials are white due to diffuse reflection, and which due to absorption/re-emission of all wavelengths?

Is there any way of knowing which white objects or materials are white due to emission of most or all wavelengths, and which due to diffuse reflection? If there is one type of material I would like ...
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1answer
7k views

Why is ice more reflective than liquid water?

Why is ice more reflective (has higher albedo) than liquid water? They're both the same substance (water). Is something quantum mechanical involved?
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0answers
83 views

Circular inversion and spherical mirrors

The object distance ($u$), image distance ($v$) and the focal length of a spherical mirror ($f$) are related by the well-known formula (using the appropriate sign convention): $$ \frac{1}{u} + \frac{...
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2answers
61 views

What force creates the reflected wave in a string attached to a rod? [duplicate]

I am a student of class 11 and I have a doubt about reflection of waves on a string tied to a massless ring which can slide on a frictionless rod. When the wave reaches its end, the ring overshoots ...
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1answer
262 views

Cube Beam Splitter Ratios in Reverse

Good day to all, I the following diagram is a non-polarized beam splitter cube with a 10:90 (R:T) split ratio. The questions I have are: that when light comes back does the 90°, R path still have a ...
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4answers
10k views

Wave reflection and open end boundary condition intuition

I need to understand one seemingly simple thing in wave mechanics, so any help is much appreciated! When a pulse on a string travels to the right toward an open end(like a massless ring that is free ...
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2answers
69 views

Number of images formed when two mirrors are placed at an angle

The formula for calculating the number of images formed when two mirrors are placed at an angle $\alpha$ is $360/\alpha$. My question is how many images will be formed when it is a fraction? My ...
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2answers
40 views

How does a non-infinite monochromatic plane ray of light know which way to refract?

I have been making a simulation of light traveling in medium from classical physics perspective and while trying to makes sence of a traveling wave packet i realized i don't understand something very ...
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3answers
165 views

Why does the electric field and not the magnetic field remains in the same direction after reflection from a medium?

I was reading up about reflection and transmission when an electromagnetic wave is normally incident on a surface. I came across this figure : My question is why is the direction of electric field ...
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5answers
75 views

Inconsistency in ray diagram

This example purports to show reflection of light rays from a spherical mirror. It looks good, until you try to draw a ray from the tip of the candle flame, then through the focal point, $F$, and then ...

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