All Questions
Tagged with refraction electromagnetic-radiation
186
questions
2
votes
4
answers
453
views
How we can explain bending of electromagnetic waves in a different optical media?
How can we explain the bending of light when it moves through different optical media by Maxwell's equations treating light as an electromagnetic wave?
-1
votes
1
answer
53
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Confusion on the indice of refraction: is it dependent on the frequency or not? [duplicate]
I saw in my course than when light hit a medium, it makes some dipole oscillating with the same frequency as the one of the light $\omega$. By a classical mechanics reasoning, one can show that the ...
- 183
0
votes
1
answer
712
views
How does Huygens' principle explain refraction?
I am told that one of the merits of Huygens' principle is that it could explain refraction, however, in the argument given in my textbook it seems flawed.
This seems like a totally idealised scenario ...
- 348
1
vote
0
answers
23
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Effective Refractive Index: Where does this formula come from? [duplicate]
In the paper, entitled "Artificial uniaxial and biaxial dielectrics with use
of two-dimensional subwavelength binary gratings" by Eric B. Grann, M. G. Moharam, and Drew A. Pommet. https://www....
- 829
4
votes
1
answer
651
views
Does phase velocity or group velocity change when light enters a new material? Contradictory sources
I'm so confused. I've read in this book (page 28) that group velocity of light can exceed $c$ in certain gases. However a lot of people online and in the forums say that phase velocity can exceed $c$.
...
- 143
0
votes
0
answers
39
views
If both violet light and red light was incident on the center of a semi circular block, and refracted, would they have the same refraction angle?
As the violet and red light have the same speed in air, with the incident angle being less than the critical, with the violet light and the red light coinciding on each other, (like on top of each ...
- 101
-1
votes
2
answers
624
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Speed of light and wavelength
Does the speed of Electromagnetic wave depend on its wave length? For vacuum I'm aware that it's a constant $c=\frac{1}{\sqrt{\mu_o\epsilon_o}}$. Similarly can we say speed of light in any medium is a ...
- 1,161
-1
votes
1
answer
406
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Why the rays do not continue in a straight line when passing through a prism?
How does the lightning that is not going through a rectangle know?
a ray that passes through a rectangle, continues in a straight line
What happens to a prism made of retangles of different lengths?
...
- 201
1
vote
2
answers
193
views
Is it possible to reduce the speed and frequency of a light wave to zero in a liquid medium?
Assume that two mirrors are located in a huge liquid medium – say, deep down on an ocean floor – with a refractive index of $n'$ as measured by an observer $A$ standing on the beach platform at rest ...
- 2,503
0
votes
0
answers
697
views
Dispersion, refractive index against frequency graph
From Hecht optics page 74, the plot of $n$ , the refractive index, against $\omega$ , the angular frequency of the incoming wave is
And the relation between $n$ and $\omega$ is:
Where each $\omega_{...
- 753
2
votes
2
answers
1k
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Why does the speed of light change? [duplicate]
While researching the cause of refraction, I found that refraction occurs due to the change of speed of light when it goes from one medium to another (according to Huygens principle).
But I cannot ...
- 315
1
vote
0
answers
88
views
Snells Law derivation from Plane Wave incidence
I am trying to derive snell's law from plane wave incidence by imposing the condition that the phase of the incident, reflected and transmitted wave at the point of incidence must be equal. Here's ...
- 111
17
votes
5
answers
5k
views
Do colors differ in terms of speed? [duplicate]
Here is a very simple question about light. As far as I remember from the school program, each color is merely one of the frequencies of light. I also remember that each color's wave length is ...
- 665
1
vote
1
answer
38
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What is the difference between ordinary-spacial cloaking and spacetime cloaking?
I am unsure of what are the differences between space time cloaking and spacial cloaking, as any event can be hidden from a viewer using spatial cloaking for however long the cloaking is activated, ...
- 124
0
votes
1
answer
2k
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Why exactly does light bend when it enters a different medium? [duplicate]
Simply: what happens to the electric(and magnetic) fields when it enters the medium? How does it interact with the molecules and how this interaction leads to the bending of light?
- 581