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History of Snell's Law

A ray of ligh...

Question

A ray of light is incident on a glass slab of reflective index 1.5 making an angle 40 with the surface. Find (a) the angle of reflection in glass; (b) speed of light in glass.

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Solution

According to snell’s law
N₁sin(i) = N₂ sin(r)
Sin(40) = 1.5 sin(r)
r = 25.32 degree
N₂= speed of light in air / speed of light in the medium
C’ = 310⁸/1.5
C’ = 210⁸m/s

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