2
votes
1answer
105 views

Relation of color and frequency for the visible spectrum

In this question the OP is looking for a way to see light that is outside of the visible spectrum without using electronic sensors. This got me wondering about the visible spectrum itself. Typically ...
2
votes
3answers
3k views

Is all kind of light same speed?

Is there any speed different between blue or red color? Is there speed different? or there are same speed?
5
votes
2answers
38k views

Why does wavelength change as light enters a different medium?

When light waves enter a medium of higher refractive index than the previous, why is it that: Its wavelength decreases? The frequency of it has to stay the same?