Question

A light ray passing through air falls on the surface of another medium, making an angle of 30° with the surface. The angle of refraction is 45°. What is the distance travelled by this ray in that medium in root 6 seconds ​

Answer 1

Answer:

Correct option is D)

When total internal reflection tales place from lateral surface, i=C

⇒60

0

=C

⇒sinC=sin60

0

=

μ

1

​

⇒

μ

1

​

=

2

3

​

​

⇒μ=

3

​

2

​

Time taken by the light to travel some distance in medium t=

c

μx

​

 

⇒

c

μx

​

=

3×10

8

3

​

2

​

×10

3

​

⇒

c

μx

​

=3.85μsec