Question
The ratio of sine of the angle of incidence to the sine
of the angle of refraction is a constant for a given colour and for the given pair of media. Which law is this?Solution
This is Snell's Law . Snell's Law states that the ratio of the sine of the angle of incidence (ฮธ1)) to the sine of the angle of refraction (ฮธโ)) is constant and is equal to the refractive index (n) of the second medium relative to the first medium. Mathematically, it is expressed as: sin ฮธ1 / sin ฮธโ = constant This constant is the ratio of the refractive indices of the two media involved. Snell's Law can also be written as: nโ sin ฮธโ = n2 sin ฮธโ where nโ and nโ are the refractive indices of the first and second media, respectively.
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