All Questions
17
questions
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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 ...
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0
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22
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What is the relationship between the energy absorbed and reemitted by an atom?
What is the relationship between the energy absorbed and emitted by an atom with the model of Lorentz?
In the Lorentz model of an atom, we have that, using the effective cross-sections we might get ...
- 75
0
votes
1
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157
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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 ...
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0
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35
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Angles with oblique incidence and polarization [closed]
I need help with a exercise, i have problem with angles.
A circular wave of left hand with |E| = 1 V / m affects the interface between two media with refractive indices n1 = 1.45 and n2 = 4.1 with an ...
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1
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45
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What would be the intensity of light if polarizer is additionally absorbing some percent of light? [closed]
I came across one question that said the polarizers are additionally absorbing 10% of light. So, can I write (I/2)(9/10) or (I)(4/10) as final intensity of light where I is initial intensity. ...
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90
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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
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0
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156
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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 ...
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110
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How is the frequency of the dipole oscillation related to the frequency of the wave emitted by the dipole?
An oscillating electric dipole with frequency $\omega$ has a power $P\propto \omega^4$. How is the frequency of the emitted wave related to the dipole oscillation frequency?
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2
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753
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How to derive the formula of angular momentum of light in Maxwell equation?
According to wikipedia,the angular momentum of light is expressed by
$$\epsilon_0\int \left(\vec E\times \vec{A} + \sum_{i=x,y,z}\vec E_i(\vec r\times \vec \nabla)A_i \right) d\vec r$$
How to derive ...
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1
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334
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Spectral full width at half max of a Gaussian light pulse [closed]
I need to calculate the spectral full width at half max (FWHM) of a Gaussian light pulse.
The frequency spectrum of a Gaussian light pulse is
$$ \tilde{E}(\omega)\propto \exp{-\frac{(\omega-\omega_0)...
- 485
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52
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How do I visualize the 'phases' of these two waves in this example?
Fig 4.1 shows a displacement-distance graph for two electromagnetic waves A and B of the same frequency and amplitude. Wave A is travelling to the right and wave B is travelling to the left.
The ...
- 254
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90
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How to properly implement Huygen's integral?
I'm really confused by what's happening ... I'm trying to propagate a beam some distance and compare initial and final intensities.
Lets say the initial electric field is just cos(200x). I then used ...
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0
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555
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Conceptual question on helmholtz equation
Given the homogeneous Helmholtz Equation $[\triangledown ^2 + \kappa^2] E= 0$, I understand $\kappa$ represents the wavenumber $\omega_0 / c$. In light of this, what physical meaning can be taken from ...
- 11
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65
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Electric Field and Magnetic field of Guassian beam [closed]
The center of the gaussian beam in glass has a beam power of 1 mW and a beam radius of 20 μm (micro meter). The wavelength of the light $\lambda_0$ is 1550 nm.
How can I find the electric field E ...
user46806
1
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1
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72
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Determining the limits of an integral
In Griffiths' Introduction to Electrodynamics, Problem 1.28 (the triangular prism question) is especially challenging for me. I do not know how the limits of x are 0 to (1-y).
My concern is the ...
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