Question

The Snell's law,the ratio of refractive indices of two media is n1, n2 is 2:1 and the angle of incidence is 30⁰.Find the angle of refraction

Answer 1

Answer:

r = 90°

Explanation:

Ratio of refractive indices of two media = 2:1

Angle of incidence = 30°

We have to find angle of refraction..

★ sin i/sin r = constant for any pair of media and for light of a given wave length. This is known as snell's law.

n₁sin i = n₂sin r

i denotes angle of incidence

r denotes angle of refraction

⭆ n₁sin i = n₂sin r

⭆ n₁/n₂ × sin i = sin r

⭆ sin r = 2/1 × sin30°

⭆ sin r = 2 × 1/2

⭆ sin r = 1

⭆ r = 90°