All Questions
Tagged with refraction electromagnetic-radiation
186
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278
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Is there a wave equation describing electromagnetic waves in materials?
Solutions to the usual wave equation for electromagnetic waves have the property that wave components of different wavelengths travel at the same phase speed $c$, so no dispersion occurs.
What I ...
- 8,640
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106
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Why is the refractive index $n$ linked to the wavevector $\hat{n}$?
Preamble: I'm studying light-light scattering in Effective QED but I notice that I don't remember a single thing from my EM/Optics courses so I decided to review some things.
Question: why is the ...
- 5,931
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What does light travel through or why it is independent of a medium? [duplicate]
According to my research and understanding I cant get over the fact that light needs no media to travel, or is it scientifically or mathematically proven?
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Why is the refractive index of blue light larger than red light in water while the refractive index of radiowaves is larger than both?
So I thought the reason why radio waves have a relatively high refractive index in water is because they have a low frequency which increases the permittivity, but blue light that has a higher ...
- 103
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Why does the wave velocity of EM signals in a wire depend on the insulator's permittivity?
I'm in an electromagnetism class and struggling with a concept. The textbook derived several equations which state that the wave velocity of an electrical signal in a transmission line depends on the ...
- 205
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How are these expressions for blackbody spectral energy density established?
My first question regarding the following is: given that it is very
close to 1 in the atmosphere, do we really need to consider the index
of refraction in this context?
In the article Radiation and ...
- 2,015
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1
answer
338
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Why does light bend when it enters a medium?
I am asking this question after referring to @benjimin answers at Why does light bend?
I found the same answer at wiki. But i found a video on youtube by doctor don (https://www.youtube.com/watch?v=...
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In refraction at an interface, is it possible for the transmission angle to be negative?
There are two possible cases of transmission shown below:
Is case 2 possible for the transmission? In other words, can the angle $\theta_t$ be on the other side? Usually, in the problems that I solve,...
- 121
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136
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Cherenkov Radiation: Does it need to be faster than light in the certain medium?
I understand that when a charged particle moves through a medium and excites the atoms nearby, it produces a blue light when the atoms 'de-excite"
However, I don't understand why it has to be ...
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1
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2
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How can I prove that $T_\pi = 0$ at Brewster's angle? [closed]
So, I've been trying to prove this with pure trigonometry just for fun, without using the fact that $R + T = 1$, but no success. Here's my last try, using a combination of both facts that the angles ...
- 103
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186
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Derivation of the refractive index dependency of the light-matter interaction hamiltonian
I tried to derive a relation of the light-matter interaction Hamiltonian in vacuum and a medium that is characterized by a linear real refractive index but I am not sure if the following is correct or ...
- 1,564
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170
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Refractive index and light-matter interaction Hamiltonian
I am wondering if the light-matter Hamiltonian obtains a dependency on the refractive index if we insert our system into a homogeneous medium that can be characterized by a scalar refractive index $n$....
- 1,564
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41
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If reflection of light can move an object as Compton scattering can the same do light refraction?
If reflection of light can move an object as Compton scattering can the same do light refraction? Should a miniature prism move due to refraction causing momentum exchange in the example on the ...
- 1,815
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Why are Snell's law and Cauchy 's and Sellmeier's equations not valid for all of EM-waves?
Is this true that a x-ray or a soft gamma-ray would bend the most among all EM-waves while passing through two different optical materials? How can happen that so energetic rays must bend their ...
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563
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Maximum value of angle of refraction
So I have been learning geometrical optics and I have a few questions:
Is critical angle the maximum value of angle of refraction when light travels from a rarer medium to a denser medium?
Is $90^\...
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