All Questions
Tagged with refraction electromagnetic-radiation
186
questions
2
votes
0
answers
45
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Photon energy-momentum relation inside a material [duplicate]
I understand that the speed of light in a medium like glass, $c_n$, is reduced by the refractive index $n$ so that we have:
$$c_n=\frac{c}{n},$$
where $c$ is the speed of light in the vacuum.
Is it ...
- 5,925
1
vote
2
answers
104
views
Speed of EM Waves
We know that for electromagnetic waves, according to Maxwell's Theory
$$v=\frac{1}{\sqrt{\mu\epsilon}}$$
Now consider an opaque object like say Gold. It has a particular value of permittivity and ...
3
votes
2
answers
162
views
Does electric field lines refract just like light? [closed]
Do electric field lines approaching a boundary at an angle get refracted and change direction just like light rays do?
Because will discussing electric field lines and flux associated with it we do ...
- 134
-1
votes
1
answer
60
views
Do any of the color bands in a rainbow contain an electrical charge relative to clouds that might explain a photo of lightning striking a rainbow?
Caveat: While I am not a physicist myself, I am extremely interested in physical phenomena. I am well versed in electrical theory, and I am aware of the attraction between the bottoms of clouds and ...
1
vote
0
answers
67
views
How does Dipole coupling affect macroscopic polarizability and refractive index
I have taken some measurements of refractive index (refractometer (commercial Brix meter), nD20 i.e. 20 degrees C and 589 nm) and density of sucrose/water mixtures and also of ethanol/water mixtures.
...
- 313
0
votes
0
answers
35
views
Why does a light wave travel at a different speed when the density of medium is different [duplicate]
Why does light waves travel at different speeds when the density of medium changes? Can you slow down light?
- 5
1
vote
0
answers
57
views
Decoherence of a laser beam via oil emulsion
This is sort of a followup to an earlier question that I posted regarding how to destroy the temporal and/or spatial coherence of a laser beam. It was suggested to me that I could use a rapidly ...
- 366
1
vote
1
answer
59
views
How does index of refraction changes with horizontal range
I am reading this ITU recomendation, and it says that the refractive index varies mainly with altitude as shown below:
What does it mean "mainly"? I understand how vertical change is ...
- 177
2
votes
0
answers
102
views
Why does refractive index increase with concentration of the medium?
I learnt that lights decrease velocity in a medium during absorbance and emission of its energy in the charged particles in the medium. From the Beer's law, I read that absorbance is directly ...
- 21
11
votes
1
answer
850
views
Refractive index of water
The index of refraction is given by the following formula:
$$
n = \sqrt{\frac{\epsilon \mu}{\epsilon_0 \mu_0}} = \sqrt{\epsilon_r \mu_r},$$
where $\epsilon_r$ is the relative permittivity/dielectric ...
- 665
0
votes
1
answer
89
views
What would stationary light look like? [closed]
I mean, have we ever witnessed what we understand and call as light at rest, and what would it look like at rest?
0
votes
1
answer
325
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Why does sound travel faster while light travels slower in hotter mediums?
Sound travels at its slowest speed in a vacuum. Once it enters hotter mediums, it travels faster. On the other hand, light travels the fastest in a vacuum. Once it enters other mediums, it travels ...
- 59
1
vote
0
answers
21
views
Why does frequent remain constant in refraction? [duplicate]
So at school the told us that:
V= f x λ
In refraction we were told that direction,speed and wavelength changes when a wave crosses different mediums, and on another occasion that frequency is the ...
- 11
3
votes
1
answer
464
views
Brewster's angle for Metal?
As metal has a high refraction index, it is possible to have Brewster's Angle for Metal when the light incident from the air? Is it possible to derive from any formula?
- 41
1
vote
0
answers
104
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Does a single photon propagate with phase velocity or front velocity through a dispersive material?
I know that we explain the slowing down of light in a dispersive medium classically, by inducing small dipoles in the medium (which holds as long as being far away from absorption bands), and the ...
- 1,803