At what angle with the normal (in degree) should a light beam fall on the surface from air to material of refractive index n = 1.732, if the angle of refraction was half the angle of incidence? Assume that the beam is not incident normally.
Options

Question

At what angle with the normal (in degree) should a light beam fall on the surface from air to material of refractive index n = 1.732, if the angle of refraction was half the angle of incidence? Assume that the beam is not incident normally.

Options

G1 Physics · Accepted Answer

Derived solution: Step 1: Apply Snell’s law n₁sin i = n₂sin r together with the geometry of the ray path and the relevant sign convention. Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is 60. Therefore the correct option is B.