Question

A glass plate whose index of refraction is 1.47 is immersed in a liquid. The surface of the glass is inclined at an angle of 53.0° with the vertical. A horizontal ray in the glass is incident on the interface. When the liquid is a certain alcohol, the incident ray arrives at the interface at the critical angle. What is the index of refraction of the alcohol?

Answer 1

âsin53/sin 90 = n/n(gl)

n=n(gl) •sin53=1.47•0.8=1.17