Question

When a ray is refracted from one medium
into another medium, the wavelength
decreases from 6000A° by 2000A° the
critical angle for a ray from second medium
will be

Answer 1

Explanation:

Given, wavelength 1 = 6000A

wavelength 2 = 2000A

Now,

u = 6000/2000

u = 3

Now ,

u = 1/ sinC

3 = 1/sinC

sinC = 1/3

C = sin^-1 (1/3)

Hope it helps....