Question

Physics Pre Lab: Reflection and Refraction

Go to the last website and explain the secret of the archer fish. Draw pictures and explain why it works from a physics point of view.

A light beam in air is incident on a glass slab with an incident angle of 48^o. It is found that the angle of refraction is 20^o. What is the index of refraction of the glass slab?

What are the units of the index of refraction

Answer 1

Inde of refraction or refractive inde is a dimensionless number .It is the defined as the ratio of the speed of the light (c) in vacuum with phase velocity of the light in medium(v) (here it is glass slab). It defines the speed of the light through the medium. It is represented as n,

If i is the angle of incidence of the ray in vacuum and r is the angle of refraction, then refractive index also defined as

As per Eq.2

i = 48o and r= 20o

then