Question

The refractive indices of 4 media a b c d are 1.44 1.52 1.65 and 1.36 when light is travelling at equal angles the angle of refraction will be minimum in which medium

Answer 1

Answer: mediumC

Explanation:

As the refractive index (1.65) of medium C is maximum then it means that there is more bending towards the normal which decreases the angle of refraction . Therefore the answer is C

Answer 2

The angle of refraction will be minimum in the medium c of the refractive index of 1.65

• The Refractive index is defined as the speed of light in the vacuum to the speed of light in the medium.
• It tells how much it can deviate the direction of refracted ray from the incident ray and the change in speed of light.
• It is also defined as-

       Refractive index, μ = sin i/ sin r

       μ  ∝ 1 / sin r

• μ is inversely proportional to the angle of refraction, this means higher the refractive index of a medium, the less will be its angle of refraction.
• Therefore, medium d with minimum refractive index - 1.36 has the maximum angle of refraction and medium c with maximum refractive index (1.65) has the minimum angle of refraction.