Question

4. Find the time taken by light to travel 1.0 m thickness
of glass whose refractive index is 1.5. Ans. 5 ns.​

Answer 1

Answer:

=5x 10^-9 or 5 nano second.

Explanation:

Velocity of light through the medium= That through vacuum/the refractive index of the medium. Hence in this case it is=3x10^8/1.5 m/s =2x10^8 3/s. So the time taken to travel 1m thickness of the glass is 1/(2x10^8)=0.5x10^-8 s=5x 10^-9 or 5 nano second.