Thursday, July 10, 2008

Snell’s law

The law of refraction: the refracted ray lies in the plane of incidence.

Snell’ law is

n1 sin θ1 = n2 sin θ2


n1 and n2 are the index of refraction of medium 1 and medium 2.
The index of refraction of a medium is the ratio between the speed of light c in vacuum and the speed of light v in that medium

n = c/v

θ1, θ2 are angles of incidence and angle of refraction in the medium 1 and medium 2.

(Chapter: Light waves)

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