All Questions
Tagged with reflection electromagnetism
120
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Why are Fresnel coefficients not symmetric?
When talking about reflection, we have the following coefficients for the electric field:
$$r_{\perp}=\frac{n_1\cos(i)-n_2\cos(t)}{n_1\cos(i)+n_2\cos(t)} \\ r_{\parallel}=\frac{n_2\cos(i)-n_1\cos(t)}{...
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Why total reflection happens at only 1 angle?
The critical angle can be intuitively understood by Snell's law.If the incident medium has a bigger diffraction index than the refracted medium then according to Snell's law the refracted ray will be ...
- 101
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Reflection of electromagnetic waves from dielectric
I have several questions regarding EMW reflection. If it will be helpful, I am thinking about the reflection of powerful EMW and problems like heating associated with it.
Does EMW reflect from ...
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Energy of evanescent wave in total internal reflection
We know that the reflective coefficient in total internal reflection is 1, which means that all energy is reflected. But we also know that for evanescent wave, Poynting vector in the direction ...
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Penetration/Reflection properties of metals exposed to EM waves
I've read many questions being answered about how electromagnetic waves (being visible or not) can be reflected and/or absorbed and/or passed through objects.
I know some waves penetrate through paper,...
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What happens to the electric field of circularly polarized light upon a normal reflection from a mirror?
Let's imagine we have Right Circularly Polarized Light propagating in the $+\hat{z}$ direction toward a perfectly reflecting mirror. Before reflection, the light has the electric field:
$$\vec{E}(z)=...
- 141
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28
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Fresnel coefficients with permanent magnetism
I am familiar with the standard derivation of the Fresnel coefficients for linear magneto-dielectrics (for instance https://en.wikipedia.org/wiki/Fresnel_equations#Derivation). However, I was ...
- 352
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What are the physics behinde reflection and refraction of electromagnetic wave at a dialectric surface?
I have understood the most of the equations that lead to the Fresnel-Equations from electromagnetic waves and Maxwell equations. But not enough to understand what is happening. So I don't ask for an ...
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How does radio wave get reflected?
Actually recently I posted a question in h-bar ($\hbar$) relates to radio wave reflection from mirror, and one of the user replied that it can't, only ionosphere can reflect it, so my question what is ...
- 758
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27
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Electrodynamics- Could a strong negative charge near a mirror push away valence electrons and render it non-reflective?
My understanding of electromagnetism would have me believe that since it is the waveform of the photon interacting with the conglomerate waveform of the "ocean" of electrons saturating a ...
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How and why (specifically) do EM waves reflect off a surface? [duplicate]
why do EM waves reflect? what is happening on the material? could anyone draw me a diagram of how the EM wave of a dipole antenna reflects off a surface?
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The relation between surface charge density to wave reflection
We know from Guass law that if an electric field hit perpendicular from dielectric medium to a metal, then a charge density develops on the surface.
$D_{in} - D_{hit} = \sigma$
Where in metal the Din=...
- 41
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138
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Can total internal reflection (TIR) occur in metals?
Is it possible to get Total Internal Reflection (TIR) when a light beam hits a metallic surface of complex index $\tilde{n}=n_r+n_ii$? If not, is there a way where a light beam can hit a metallic ...
- 225
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Analysis of the reflection in metal
In order to solve the reflexion in a material with a complex index the solution I've found on textbooks is to define $\hat{n}\cos{\phi}:=a+bi$ where $\hat{n}=n_r+n_ii$ is the complex index and then ...
- 225
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Size of metal domain needed to reflect light ; are small graphene sheets shiny?
I remembered that shininess of a material is because of reflection, ie surface current responding to light. Mathematically, one can solve Maxwell equations under a relevant boundary condition, with ...
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