Question

Velocity of light in a medium is 2 × 108 m/s. What is the refractive index of the medium w.r.t. air? (velocity of light in air = 3 × 108 m/s)

Answer 1

answer= 2

iven : Velocity of medium =1.5×10  

8

m/sec.

           Velocity of light, c=3×10  

8

m/sec.

To find : n=?

            n=  

v

c

​  

 

            n=  

1.5×10  

8

 

3×10  

8

 

​  

 

               =2

           n=2

Hence, the refractive index of the medium with respect to air is 2.

Answer 2

Explanation:

velocity of medium = 2 × 10^8

velocity of light ,c = 3 × 10^8

n = c/v

n= 3×10^8/2×10^8

n=3/2

n=1.5

refractive index of medium w.r.t air is 1.5