Question

when light in a medium of index n1 approaches a medium of index n2 total internal reflection can occur if
a) n1B) n1>n2
c) n1=n2
d) none of the above
and please why help

Answer 1

Answer:

Option (B) n₁ > n₂

Explanation:

We know that if light enters from one medium (refractive index n₁)  to the other medium (refractive index n₂)and the index of refraction for the first medium if greater than the other then the light bends away from perpendicular.

If the angle of incidence keeps on increasing, the light will keep on moving away and away from the perpendicular and at one instance the angle of refraction will be 90°. This phenomenon is known as total internal reflection.

The necessary condition for total internal reflection to occur is that the refractive index of the first medium should be greater than the second.

Therefore, the correct option is (B)