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Results tagged with visible-light
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user 701
Questions related to the perception and measurement of light (primarily in the visible range), its mathematical description, the reproduction of colors by different means, color combinations, etc. Please use the tag [electromagnetic-radiation] if you want to refer to the general form of light.
3
votes
Accepted
Can a broken light filter shift the wavelength of light exiting it?
No, there is no way to convert a beam of HeNe laser to a laser beam of another wavelength with a glass filter. There are some phenomena, like fluorescence or Raman scattering, that will produce light …
- 4,700
18
votes
Accepted
Is colour, as represented using primary colours, accurate only to humans?
No, they will not appear the same. Humans have three color receptors so any possible color for us is just three numbers in RGB space. However, electromagnetic spectrum is continuous and there is an in …
- 4,700
10
votes
What {R,G,B} values would represent a 445nm monochrome lightsource color on a computer monitor?
There is no way to display a monochromatic light on a RGB monitor: RGB-value is a mixture of three light sources, it cannot be monochromatic by definition even if R, G and B components are monochromat …
- 4,700
1
vote
Negative frequency contributions for very short pulses?
The problem lies in the premise that a light pulse that is $1\,\text{as}$ long can have mean frequency around $10^{15}\,\text{Hz}$. Electric field has to rise and fall within $1\,\text{as}$, which c …
- 4,700
2
votes
Accepted
Resampling spectral data?
It is absolutely fine to interpolate color matching functions since they are nice and smooth. I would use spline interpolation instead of linear, but with such small increments (5 nm) you will hardly …
- 4,700
1
vote
Is the plasma state always visible?
Hydrogen plasma is probably invisible because all atomic lines of hydrogen are in the ultraviolet region.
Somewhat related - hydrogen flame burning in air is completely invisible.
- 4,700
3
votes
Does putting color filters make the sources incoherent?
This will not happen because color filters don't work like this.
A red color filter does not convert blue photons to red photons. It absorbs photons that are not red (most of them) and lets red photo …
- 4,700
13
votes
What longest time ever was achieved at holding light in a closed volume?
My answer is not much different from the other ones, but it is based on my personal experience. For several years I have been using Cavity ring-down spectrosopy(CRDS) - the method to measure very weak …
- 4,700
0
votes
Accepted
Why is the spectrum of a blue flame the way it is?
Atoms and small molecules have discrete energetic states. When an excited molecule relaxes to the ground state by emitting a photon, the energy (wavelength) of this photon is equal to the energy diffe …
- 4,700
0
votes
How to test cutoff frequency of IR filter on camera?
Every digital camera has an IR filter on top of its CCD sensor - these sensors are more sensitive to the IR light (700-800 nm) than visible. To get pictures with colors that are close to what we see, …
- 4,700