All Questions
Tagged with optics wavelength
149
questions
1
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2
answers
66
views
Physics experiment with sound [duplicate]
I am doing an experiment for a school project which consists of blowing into 6 different bottles to create different notes/harmonics. Each bottle is filled with different volumes of water to create a ...
20
votes
8
answers
5k
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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 ...
0
votes
1
answer
133
views
If most types of practical lasers produce a large number of half-wavelengths, then how are they practical for use at all?
I am currently studying Laser Systems Engineering by Keith Kasunic. Chapter 1.2.1 Temporal Coherence says the following:
Axial (or longitudinal) modes are determined by the geometrical fit (or ...
- 889
1
vote
1
answer
454
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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
4
votes
1
answer
950
views
How Small a Slit can Light Pass through?
If you imagine light source passing through a single slit of variable thickness, as you lower the thickness of the slit the light will diffract more and more until the slit is small enough that no ...
- 535
1
vote
2
answers
274
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Maximum resolution of lens with infinite aperture
Because the resolution of an objective is limited by the diffraction of its circular aperture, I don't understand why an infinite lens can not have an infinitely good resolution power.
People use Abbe ...
- 23
0
votes
1
answer
883
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The maximum wavelength obtainable from a diffraction grating
I am trying to understand what exactly is meant by the following question:
What is the maximum wavelength that can be obtained with a given diffraction grating in (a) the first order (b) the second ...
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0
votes
1
answer
59
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Why is refraction of light at a boundary wavelength dependent, and are the two proportional? [duplicate]
Just wondering, why is it that blue light will refract less than red light, i.e. why does the fact that blue light has a shorter wavelength mean that it will refract less at a boundary?
I read ...
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1
vote
1
answer
466
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How would you make a RGB LED equally bright to a broad-spectrum white LED?
Say you had a broad spectrum white LED (all visible wavelengths) and you wanted to make a RGB LED (just red-green-blue wavelengths) that could produce white light of equal brightness to the broad-spec ...
- 309
22
votes
3
answers
4k
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Can you create white light by combining cyan wavelengths (490-520nm) with red wavelengths (630-700nm)?
Cyan (blue light + green light) + red light = white light,
but is the same true for cyan wavelengths ($490-520$ nm) and red wavelengths ($630-700$ nm)?
- 309
4
votes
5
answers
2k
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Why is wavelength of violet colour less than wavelength of blue colour?
The wavelength of light of specific colour increases as we go from left to right in the visible colour spectrum: "VIBGYOR".
Wavelength of green lies between wavelengths of blue and yellow. To me, ...
- 377
27
votes
9
answers
8k
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What determines whether colors you can't see are visible or not?
So, when someone is red-green colorblind, the colors appear the same to them, like this:
Source: https://iristech.co/what-do-colorblind-people-see/
And if you're totally colorblind, then things ...
- 397
3
votes
1
answer
234
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Does modulating a laser source change its color?
Hopefully you guys can solve this hypothetical for me.
Suppose I have a laser which emits light at frequency $530\mathrm{THz}$ with a very narrow spectral width $1\mathrm{Hz}$.
From signal theory, ...
- 91
1
vote
4
answers
480
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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, $\omega(k) ∝ k$, ...
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