1
vote
2answers
48 views

On what refractive index of medium depends ? [duplicate]

does the refractive index of a medium depends on wavelength of light passing through it ? If yes then why ?
0
votes
1answer
56 views

Dispersion relation of silicon

In the case of dispersion relation of silicon having crystal plane orientation 111; what is the Sellmeier's equation for refractive index $n$ of silicon orientation 111 & what it's extinction ...
2
votes
3answers
431 views

Two different mediums can have equal index of refraction?

In other words: given a certain medium, is light's phase velocity unique?
19
votes
3answers
2k views

Why do prisms work (why is refraction frequency dependent)?

It is well known that a prism can "split light" by separating different frequencies of light: Many sources state that the reason this happens is that the index of refraction is different for ...
3
votes
1answer
256 views

Fermat principle: which index of refraction?

I am somewhat puzzled by a common formulation of the Fermat principle (light travel time), because it contains index of refraction related to phase velocity while light travel time through a slab of ...