what is refractive index?why is it inversely proportional to speed of light in a particular medium?
Asked by ashwati | 22nd Dec, 2008, 10:24: PM
Expert Answer:
Refractive index of 2nd medium w.r.t. 1st medium = sin i/ sin r ; where 'i' is the angle of incidence and 'r' is the angle of refraction.
Also,
refractive index = speed of light in vacuum / speed of light in the given medium.
The speed of light in vacuum has a fixed value, so
r.i. of a substance is inversely proportional to its speed in that medium.
Answered by | 23rd Dec, 2008, 11:09: PM
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