Geometrical Optics

Refraction and lenses

3x108m/s .

. . ! .

. . . .

Index of refraction n. n .

c v :

Vacuum n=1, Air n=1.0003, Water n=1.33, Glass n=1.46, 1.52, 1.58, Diamond n=2.42

ExampleCalculate the speed of light in diamond.

Solution

Snell's law for refraction n1 n2 n2>n1 (a) (b)

(b) (a)

Snell

n2>n1 q2n2 q1