Question

The critical angle for a pair media is 45.calculate relative refractive index of denser medium w.r.t.rarer medium

Answer 1

Answer :

Critical angle of medium = 45°

We have to find refractive index of denser medium wrt rarer medium$.$

★ Critical angle is the angle made in denser medium for which the angle of refraction in rarer medium is 90°. When angle is denser medium is more then critical angle the light ray reflects back in denser medium following the laws of reflection and the interface behaves like a perfectly reflecting mirror.

Formula : η = 1 / sinC

• η denotes refractive index
• C denotes critical angle

By submitting the values, we get

➝ η = 1 / sinC

➝ η = 1 / sin45°

➝ η = √2

★ Refractive index of a medium is defined as the factor by which speed of light reduces as compared to the speed of light in vacuum.