Question

A substance has critical angle 45° for yellow light. What is its refractive index ?

Answer 1

solutions:u=1/sin ic= 1/sin 45°=1/1/under root2

Answer 2

Answer:

√2

Explanation:

Refractive index is defined as the  the ratio of the speed of radiation such as the light in one medium like glass, air or a vacuum to that in an another medium. It also describes as how the light travels through a medium. It is a dimensionless measure and defines how much a light ray can bend when it enters from one medium to another.

Refractive Index = c/v

where c is the speed of light in a vacuum, and v is the velocity of light in the specified material. Thus for the yellow light -

μ = 1/sinic

= 1/sin45∘

= √2

Thus, the refractive index for yellow light will be √2.