Question

Select the correct answer.

Answer 1

Answer: 65°

Explanation:

According to Snell's law, which states that ratio of the sine of the angle of refraction and the sine of the angle of incidence is always constant and equivalent to the ratio of phase velocities of the two mediums it is passing through.

nr / ni = sin I/ sin r

r = 38°

I = ?

ni = 1

nr = 1.47

1.47 / 1 = sin i / sin38

Sin I = 1.47sin38

Sin I = 0.9050

I = sin-¹ 0.9050

I = 64.826°

I = 65°