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Results tagged with visible-light
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user 12623
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.
5
votes
Is there something special in the visible part of electromagnetic spectrum?
There is nothing special concerning the visible light from fundamental point of view. You can have the same amount of information in any other part of the spectrum; note, however, that it has to be si …
- 3,009
8
votes
Intensity of light
The light intensity $I$ is the power $P$, that irradiates an area $A$, $I=P/A$, therefore the units $\mathrm{W}\mathrm{m}^{-2}$. This means, that if you have two beams with equal intensities, the area …
- 3,009
5
votes
Accepted
Colors in the secondary rainbow reverse of that in the primary rainbow
When a primary rainbow is formed, it is due to one total reflection in water droplets. A secondary rainbow is formed by light that underwent two internal reflections, and that is what changes the orde …
- 3,009
1
vote
Accepted
Transmission of Gaussian Beam Through Graded-Index Slab
The ABCD law can be used for Gaussian beam propagation using the complex beam radius $q$. Defining $\frac{1}{q} = \frac{1}{R}-i\frac{2}{kW^2}$, $R = R(z)$ being the radius of curvature of the beam and …
- 3,009
10
votes
Accepted
Optical equivalent of a superconductor
As Claudius suggests, vacuum does not absorb. But that is not a material.
You can have light that travels through a material without absorption; that happens in nonlinear optics with self-induced tra …
- 3,009