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CBSE - X - Physics - Light - Reflection and Refraction


Asked by pritam 7th April 2010, 7:09 PM
Answered by Expert


The sine of the angle of incidence bears a constant ratio with the sine of the angle of refraction for a given pair of media. This law is also known as the Snell's law, named after Willebrord Snell.
The ratio sin i / sin r gives the refractive index for a a given pair of media.

Refractive Index = sin i / sin r = speed of light in medium 1 / speed of light in medium 2

If medium 1 is vacuum, the ratio c1/c2 is defined as the absolute refractive index of medium 2, and is denoted by 'μ' (mew).

Hope this helps.

Answered by Expert 8th April 2010, 10:26 AM

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