Question

The velocity of light in vacuum is 3 * 10^10 cms^-1. The velocity of light in a medium (u=1.5) is:
1) 2*10^10cms^-1
2) 4.5*10^10cms^-1
3) 1.5*10^10cms^-1
4) None

Answer 1

Answer:

Velocity of Light in vacuum (c) = 3*10^10 cm/s

= 3*10^8 m/s

Refractive Index of medium (u) = 1.5

u = c/V

1.5 = 3*10^8/V

1.5V = 3*10^8

V = 2*10^8 m/s

The Velocity of light in such medium is 2*10^8 m/s.

I hope this helps.

Answer 2

Answer:

Velocity of light in medium ( u=1.5) is 2*10^8 m/s.

Explanation:

here, velocity of ight in vacuum, c is 3*10^8 m/s.

        refractive index of the given medium, v is 1.5

we know, refractive index = c/v

               v= c/refractive index

               v = 3*10^8/1.5

               v = 2*10^8 m/s

therefore, velocity of light in medium ( u=1.5) is 2*10^8 m/s.