Question

Define refractive index .If the speed of light in air is 3 x 10 8 m/s and the
speed of light in water is 2.2x10 8 m/s. Calculate the refractive index of water.

Answer 1

Answer:

Refractive index = 1.33=4/3

speed of light in air (c)=3×108,

speed of light in water=?

Explanation:

u=c/u

4/3 = 3×108/u

= v=3×3×108/4= 9×108/4

=v=2.25×108m/s.

hence, speed of light in water is 2.25×108m/s.

Answer 2

Answer:

refractive index:- c/v

where c is speed of light in air and v is speed of light in water,

now,

n= c/v

=3* 10^8 / 2.2* 10^8

=1.36

=1.4 (aprox.)