Question

A parallel beam of monochromatic light is incident on glass slab at an angle of incidence 60°. Find the ratio of the widths of the beam in glass to that in air, if refractive index of glass is 1.5.

Answer 1

Given: i = 60°, μ_g = 1.5,

Let d_g = width of beam in glass slab,

d_a = width of beam in air

\(\therefore\) Ratio of the widths of beam = 8 : 5

The ratio of widths of the beam in glass to that in air is 8 : 5.