A ray of light enters a diamond (n = 2) from air and is being internally reflected near the bottom as shown in the figure. Find maximum value of angle θ possible ?

Question

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 θ < sin⁻¹(2 sin 15°). Therefore the correct option is D.