Explain snell's law?Why is refractive index of a substance inversely proportional to its speed?

Asked by ashwati | 20th Dec, 2008, 11:00: PM

Expert Answer:


Snell's Law states:

'For a given pair of media,

sine of angle of incidence (in media 1)
sine of angle of refraction (in media 2)

is a constant, denoted by 1n2. This is an alternative definition of the refractive index of material 2 relative to material 1.

Now, refractive index of a = speed of light in vacuum / speed of light in the given medium.

This explains why r.i. of a substance inversely proportional to its speed.

Answered by  | 21st Dec, 2008, 01:19: PM

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