All Questions
24
questions
11
votes
4
answers
2k
views
Can the laser light, in principle, take any wavelength in the EM spectrum?
Can the laser light, in principle, take any wavelength in the EM spectrum? I don't think there is what prevent this in principle, right?
- 959
1
vote
0
answers
71
views
Does our sense of color depend on frequency of source or the wavelength of light?
I was taught that the colors we see are results of the corresponding wavelength, but each wavelength also has a distinct frequency since speed of light is fixed for a specific medium (same goes for ...
- 169
0
votes
2
answers
360
views
What is the wavelength of white light? [closed]
Does white light have a wavelength, and I know that the sun emits white light, but the atmosphere makes it refract to make it appear yellow to us. Do all the stars in the universe emit white light?
0
votes
1
answer
44
views
What is the difference between $v=fλ$ and maximum velocity in the formula $v=ωY_{\max}$? [closed]
I was wondering what the difference is between speed in the formula $v=fλ$ and maximum velocity in the formula $v=ωY_{\max}$ as applied to a wave.
- 13
20
votes
8
answers
5k
views
What does the "true" visible light spectrum look like? [closed]
When I google "visible light spectrum", I get essentially the same image. However, in each of them the "width" of any given color is different.
What does the "true" ...
- 337
0
votes
2
answers
60
views
Is there any way to differentiate UV light from visible or IR light?
I'm working on a small sensor system that responds to only UV light and I wanted to know that is there any way to differentiate between UV light and the rest of the spectrum like using lens if so then ...
1
vote
1
answer
454
views
Differentiating $\nu = \dfrac{c}{\lambda}$
I am currently studying Laser Systems Engineering by Keith Kasunic. Chapter 1.2.1 Temporal Coherence says the following:
The coherence time $\tau_c$ over which the emitted wavelengths are considered ...
- 889
1
vote
4
answers
480
views
Question about dispersion relation
I'm confused about the nonlinear dispersion relation like $\omega(k) ∝ k^2$.
Does this kind of wave have multiple frequencies?
I have always considered the linear dispersion case, $\omega(k) ∝ k$, ...
- 185
0
votes
2
answers
189
views
What is considered the frequency (and wavelength) of guided waves in a waveguide?
In a rectangular waveguide with sides of length $a$ and $b$, the dispersion relation is
$$\beta^2 =\omega^2\mu\epsilon=\beta_z^2+\beta_x^2+\beta_y^2=\beta_z^2+\beta_s^2.$$
So we have
$$\beta_z = \...
- 27
4
votes
4
answers
3k
views
How exactly is white light a combination of several wavelengths? [duplicate]
I have read that light is an electromagnetic wave. Every ray of light has a specific wavelength. The colour perceived by any observer is dependent upon the wavelength of the incident light.
What I ...
- 170
0
votes
0
answers
54
views
Why frequency does not change when light passes through the denser medium? [duplicate]
as far as I noticed always people in physics have a predefined assumption that frequency is constant. whereas we know that the c is the outcom of product of wavelength and frequency. we have different ...
1
vote
2
answers
1k
views
Dispersion through Glass Slab
My questions related Dispersion through Glass Slab:
Why does a parallel surface makes a difference?
Why is that light do get disperse in a prism and a glass slab at surface one but at backs normal ...
user232991
1
vote
1
answer
135
views
Converting $\mathrm{ps/nm}$ to $\mathrm{ps}^2$
I have a dataset in the unit $\mathrm{ps/nm}$ for many different $\lambda$ which I want to convert to $\mathrm{ps}^2$.
I guess I can assume that I only deal with Gaussian bandwidths such that $1\ \...
- 139
0
votes
1
answer
84
views
Why the purple and red light entering the prism is broken at different angles? [duplicate]
Lights entering the prism with different wavelengths at the same angle. why go to different directions? what happens step to step between the protons&electrons in glass and the photons? what is ...
-1
votes
3
answers
96
views
The color of a refracted ray
My textbook explains the cause of the refraction of light as the "difference between the speeds of light when passing from medium 1 to medium 2". The same textbook explains that the cause of the ...
