All Questions
Tagged with reflection electromagnetic-radiation
187
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What happens when a linear polarized EM wave encounters a perpendicular mesh of wires (which are electrically connected)?
Assume a radio wave with wavelength 1 m is traveling in the negative z direction when it encounters a grid of closely spaced wires (say, 10 cm separation) laying in the xy plane, with each wire ...
- 93
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Reflection due to wave nature of light
In my high school, I am studying geometrical optics. I studied why smooth surfaces like mirrors form an image of an object but rough surfaces like a wall don't (due to regular reflection and irregular ...
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Electromagnetic reflection without velocity change
The Fresnel equations describe the reflection and transmission of electromagnetic waves between two media. The parameter in the equations is the impedance ratio, where the impedance is $Z=\mu/\epsilon$...
- 2,141
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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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How can a greater than 1 reflectance coefficient be explained in $\rm SiC$-$\rm SiO_2$ interface?
I ran a simulation using the Transfer Matrix Method to plot the R,T and A curves for a SiC->SiO2 interface. There's a region of incident energies where the |r|^2 I get is higher than 1 and the ...
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What is the speed of light during reflection? [duplicate]
What is the speed of light in a vacuum when the light reflects off of a mirror?
- 331
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Infinite reflection inside a glass loop
If you had a loop made of completely transparent glass (or other material), in the shape of a donut; think atomic collider (but probably not needing to be so large :) ), and you introduced light from ...
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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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Electromagnetic waves reflection?
I have a couple questions regarding the EMW (in my case, 2.4–2.5 GHz) reflection:
Could dialectric materials reflect electromagnetic energy, and how does this impact the efficiency of such reflection?...
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197
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What are the reflective properties for 77 GHz electromagnetic waves (automotive RADAR)?
Automotive radar uses electromagnetic waves around 77 GHz frequency. Is there some data, tables available about the reflectivity of such waves for various materials, like water, stone, people, metal ...
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Two-Ray Ground-Reflection Model: Understanding the Difference in Phase Offsets at the Receiver
Currently, I'm trying to understand the Two-Ray Ground-Reflection Model.
During my research, I came across the following simplification expressing the received power as follows (taken from Wikipedia):
...
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If photons are massless, how are they reflected and blocked by something that has mass? Shouldn't they pass right through any object?
If photons are massless, how do they get reflected, blocked when something comes in its way? Shouldn't the particle just pass right through any object?
- 351
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Why does gold only glow red after flame is removed?
I was at a jewelry workshop today and saw somebody place a gold ring under an intense flame. Weirdly, the ring looked normal when underneath the flame, but glowed "red-hot" as soon as the ...
- 3,407
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Why are things reflective, absorbent, transparent etc? [duplicate]
What determines whether a material reflects, absorbs or transmits a certain wavelength of light? Just a layman's question.
- 111
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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 ...
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