Question

(c)
20. With the help of a labelled diagram, state and explain the laws of refraction of light.
Light travels through air at a speed of 3x10^8 m/s.On entering in another medium its speed
becomes 2 x 10^8 m/s. Calculate the refractive index of other medium.​

Answer 1

2\3=0.6666.....

Explanation:

refractive index (n)= velocity of light in vaccum\velocity of light in medium

n=v/c

n=2*10^8/3*10^8

n=2/3

n=0.666......