All Questions
Tagged with refraction electromagnetism
122
questions
4
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2
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708
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Intuitive meaning of the permittivity and the permeability in Electromagnetism
I wonder what the correct way to intuitively understand the concepts of electrical permittivity and magnetic permeability would be.
The electric permittivity $\varepsilon$ of a medium is defined as a ...
- 974
0
votes
2
answers
131
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Are there materials that just change the speed of light?
Maxwell's equations in medium without charges read
\begin{align}
0&=\nabla\cdot D\,,\\
0&=\nabla\cdot B\,,\\
0&=\nabla\times E + \dot B\,,\\
0&=\nabla\times H - \dot D\,.
\end{align}
...
- 1,291
1
vote
1
answer
123
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Why it is necessary that phase of incident, reflected and refracted wave must equal at the interface of two medium?
1.Why it is necessary that phase of incident, reflected and refracted wave must equal at the interface of two medium to satisfy the boundary conditions at the interface?
2. According to boundary ...
1
vote
0
answers
54
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In anisotropic media, is there a speed of light tensor like there is a refractive index tensor?
Lets say we have an homogeneous anisotropic medium where $\tilde\mu_r=\tilde\epsilon_r$ so we don't have to worry about polarization effecting anything. As such, the refractive index can be simply ...
- 780
1
vote
2
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799
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$E$ field boundary condition and Snell`s law
So, for E field boundary condition, we know the vertical part of the incident field
$\varepsilon _{1}E_{1\perp } = \varepsilon _{2}E_{2\perp }$
and the tangential parts are same from both side.
That ...
- 113
0
votes
1
answer
628
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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} + ...
- 284
1
vote
3
answers
2k
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Are the amplitudes of the electric field and the magnetic field of an electromagnetic wave equal?
In an electromagnetic wave, is the maximum amplitude of the electric field the same as that of the magnetic field? I ask this question which may seem silly because on all the diagrams representing an ...
1
vote
1
answer
108
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Ampere's Circuital law in non-linear and dispersive medium
For a linear and non-dispersive medium $\vec{B} = \mu \vec{H}$.
So amperes circuital law in integral form (without Maxwell's correction term) can be written in two ways
$\oint_C \vec{B}\cdot\vec{dl} =...
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?
2
votes
2
answers
155
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Electromagnetism Permeability of vacuum [duplicate]
How vacuum could have electromagnetism Permeability when there is no molecule in it.
(Permeability of other medium get describe with effect of their polar or magnetic molecule)
- 121
0
votes
1
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127
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Gravitational light bending and refraction? [duplicate]
I've trying to read up on the evidential merit of general relativity and am rather curious as well as skeptical of early as well of possibly later more rigorous measurements of light (electromagnetic ...
1
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0
answers
273
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Effective Refractive Index in Paper
I am reading 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://...
- 829
5
votes
1
answer
241
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EM wavelength in different medium
Considering a light wave traveling from the vacuum to air, I am trying to find what will happen to its wavelength.
At first, using optics, we know that:
$$n=\frac{c}{v}$$
where $n$ represents the ...
- 121
1
vote
4
answers
118
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About the lowering of the speed of light in non-vacua
I don't understand really why matter interacts with light so as to slow down wavefronts to a speed strictly below $c$, but still preserving that sharp wavefront-like signal.
This is somewhat ...
- 643
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2
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2k
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If different wavelengths of light have different speeds, how can they move together as a white light in air?
My question is with respect to Newton's experiment of using two identical glass prisms [in which one is inverted with respect to the first one]. When he allowed all the colors of the spectrum to pass ...
