Questions tagged [reflection]

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Reflected light microscope semi-transparent mirror

When a light microscope is used in the reflected mode there is a semi-transparent mirror angled at 45 degrees that reflects a portion of the light onto the sample. The sample in turn reflects the ...
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Echo sound wave plotting [closed]

https://en.wikipedia.org/wiki/Echo Echo - Reflection of sound sinusoidal wave plotting can be possible with computer programs?
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1answer
78 views

Derivation of Snell's Law

I am following an example in the book "Electromagnetic Waves and Antennas" by S. Orfanidis. He has two planes waves incident on both sides of a boundary. Here, $k_{\pm} = \hat{x} k_{x \pm} + ...
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1answer
16 views

Will an infrared laser reflected back on itself lose data carried by the beam?

I'm passing a 1392nm laser through a beamsplitter, through an aresol medium hitting a retroreflector, passing back through an aresol medium, and passing it through the same beamsplitter. The two beams ...
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0answers
28 views

Why is crystalline graphite black yet shiny?

I am unable to find images of pure crystalline graphite with high confidence, but based on various sources I believe that it should actually be both black and shiny, in the sense that it reflects much ...
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Measuring the complex susceptibility from power reflectivity

We are in vacuum and have a non magnetic material of which we want to determine the frequency dependence of the complex susceptibility with nothing than the power reflectivity. How could that be done? ...
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1answer
43 views

What does the statement “A concave mirror always forms a real image of a virtual object” mean?

My Physics teacher made the statement in a recent class. "A concave mirror always forms a real image of a virtual object" But, what did he mean by a virtual object? What does this ...
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Albedo Conversion Scheme

I was reading some papers a while ago and wrote the following equation: $$\alpha = 0.57\alpha_{\text{VIS}} + 0.47\alpha_{\text{NIR}}$$ It is a narrowband to broadband albedo scheme conversion, I ...
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1answer
17 views

Position of the object pin to observe parallax

Pin is kept in front of a concave mirror at a distance $x$ . Observer shifts his gaze towards the left,the inverted image of pin appears to the right. Then $f<x<2f$ . Here I understand that the ...
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4answers
60 views

How can I view through the water surface without reflection? [closed]

I am searching for a possibility to see the shallow grounds of water without reflections on the surface. I am sailing in an area where there are reefs and shallow coral patches which can be dangerous ...
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1answer
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What happens to the rest of the light that didn't get filtered by polarized film?

Suppose I used a polarized film to produce say left circularly polarized light, I wonder what happens to the rest of the light that gets absorbed or reflected away? Are those unpolarized or right ...
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Diffusion of a particle between two immiscible liquids

I am trying to find a model, or construct my own to describe the diffusion of a particle between layers of immiscible fluids with different densities. The particle size is much larger than the sizes ...
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Interferences of TE and TM mode light reflected once

I have derived a transfer matrix calculation for LED systems. It is known that reflection amplitudes have a 180-degree phase shift between TE and TM modes less than the Brewster angle. This makes ...
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1answer
63 views

Inside a car with light bouncing vertically between two mirrors, now if the car starts moving will the light also move with the car?

Consider two person one is travelling in a space ship and one is on the moon, now in the space ship there is a device where a light beam or photon is bouncing between two mirrors now when the space ...
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0answers
45 views

How do we see things? [duplicate]

What I mean is, suppose white light falls on a red object and is reflected, so when we see the reflected light reaches our eyes we see it as red (probably because its wavelength corresponds to red). ...
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1answer
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Problem involving lenses and mirrors [closed]

A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance between the lens and the mirror is 10 cm. A small object is kept at a distance of 30 cm from the lens. The final image ...
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2answers
47 views

Optics: mirrors

While drawing ray diagrams for plane and spherical mirrors, what is generally taken as the point of observation? Eg, If a concave mirror is presented with, say a wire turned into a triangle, placed ...
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3answers
40 views

How does mirror create stimulated atoms in laser

I know excited atom can emit photon at any direction as long it stays consistent so the total angular momentum and spin states are conserved, this is spontaneous emission. What about stimulated ...
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2answers
30 views

What effect does surface have on light absorption at different wavelengths?

I am a bit confused and need a well rounded explanation. Have a look at two scenarios: A metal plate with small scratches on it appears diffuse in the optical spectrum, because the roughness reflects ...
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2answers
46 views

Why are TV signals weaker during bad weather?

I know that the TV and radio waves that are received and transmitted are non mechanical waves. However during storms or bad weather in general, the television signals get weaker and the program ...
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16 views

Light rays || to each other but not Principal axis

If a Ray of light travelling parallel to principal axis is incident on a concave mirror, then after reflection it will pass through focus. If however we have two rays of light that are parallel to ...
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1answer
44 views

Why can we see light when it isn't being reflected back to us at the same angle?

If I am standing on a chair, and I point a laser at a coffee table a few meters away from me (that is also below me), the light should reflect away from me. Therefore, no light should be returning to ...
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1answer
34 views

Reflection of light from a plane surface [closed]

Why do we witness scattering of light from mobile screen even when we have a plane screen to reflect light falling from any source of light (tubelight) onto the screen?
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0answers
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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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2answers
51 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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17 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
27 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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1answer
40 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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1answer
59 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
53 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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2answers
80 views

What would happen to the Sun if you reflect all its emitted e.m. radiation back? [duplicate]

What would happen to the Sun if you would reflect, in whatever way, all the outgoing electromagnetic radiation (Solar winds can be neglected)?
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33 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
27 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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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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3answers
41 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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1answer
28 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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0answers
18 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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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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1answer
66 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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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
53 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
24 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
29 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
12 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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0answers
84 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
41 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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2answers
65 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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