All Questions
15
questions
1
vote
1
answer
31
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Effect of incident angle on wavelength of transmitted wave for normal polarisation?
In my electrodynamcis assignment I'm being asked to derive the wavelength of a normally polarised wave transmitted through a glass/air interface as a function of $n_1$ (the refractive index of the ...
- 11
0
votes
1
answer
157
views
Unpolarized light incidence
A beam of unpolarized light carries 2000W/m2 down onto an air–plastic interface. It is found that of the light reflected at the interface 300W/m2 is polarized with its $E$-field perpendicular to the ...
- 980
0
votes
1
answer
350
views
Finding angles of second and third order minima given only angle of first order minimum
For the following problem we are asked to find the second and third order minimums of a single slit diffraction experiment at $13^{\circ}$. I tried using the following $$\theta_p=p\cdot\frac{\lambda}{...
- 101
1
vote
2
answers
101
views
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
1
vote
1
answer
442
views
Finding the phase difference of two interfering waves
A system illustrated in the given figure consists of two coherent point sources $1$ and $2$ located in a certain plane so that their dipole moments are oriented at right angles to that plane. The ...
0
votes
1
answer
90
views
EM- waves in anisotropic medium
When ElectroMagnetic waves from vacuum enter the anisotropic medium. If the $\epsilon$(permittivity) matrix is diagonal (with not all diagonal entries being equal). There'll be two waves in the ...
- 101
0
votes
0
answers
39
views
How to find the fringe width of an interference pattern created by a spherical and a plane wave?
If we have two equations of a spherical and a plane wave (given that the plane wave is propagating along the $z$ direction), how do we find the fringe width of the interference pattern that would be ...
1
vote
0
answers
156
views
Electromagnetic wave in a prism
Imagine an electromagnetic plane wave entering perpendicular to one of the faces of a prism with the form of a triangle rectangle, which is made of a certain material of refraction index $n$. The wave ...
- 1,172
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votes
1
answer
1k
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When given light colour and refractive index, how do I find wavelength?
Example situation
If I knew that this green light, which has a wavelength of 500 nm in air, travels through a medium with a refractive index of 2.4, how would I find the wavelength in the medium?
...
- 147
0
votes
2
answers
319
views
Why is this question indicating a Fraunhofer Region rather than Fresnel Region?
I was thinking that because the source plane is infinitely large would be analogous to having the source plane being infinitely close, which would imply a Fresnel region rather than Fraunhofer.
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- 1,325
0
votes
1
answer
2k
views
Equations of Fermat's principle/Snell's law in a gradient lens (sugar aquarium)
I'm trying to animate a beam of light inside a substance with gradient index of refraction as a function of y. A good example of that is a syrup inside an aquarium like here https://www.youtube.com/...
- 59
0
votes
1
answer
1k
views
Lasers : Threshold Pump Power for Laser Oscillation [closed]
I was working my way through some basic laser problems , when I cam across this one :
Consider the ruby laser for which we have the following values of the various parameters:
$N =$ $1.6$ x $10^{19}$ ...
- 123
4
votes
2
answers
514
views
Locations of destructive interference for two spherical waves
I have looked at this, but it did not help with locations. Really this just comes down to mathematical manipulation, which for some reason I fail to see. Here is my paraphrased setup:
Consider two ...
- 752
5
votes
2
answers
4k
views
Make a semi transparent mirror with copper
The question:
How would you make a semi transparent mirror (50% reflection, 50% transmission) with glass with a layer of copper. For light $\lambda$ = 500nm Try to be as realistic as possible
What I'...
- 215
3
votes
2
answers
5k
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Michelson rotating mirror experiment
Could someone explain the calculation required to answer this question. It is from a text book and the answer is recorded as 585Hz but I cannot replicate the answer.
In 1931 Michelson used a ...
