A medal in a plastic cube whose index of refraction is 1.5 appears to be 20 mm below the upper surface of the cube. The depth of the medal is actually
A) 10 mm.
B) 13 mm.
C) 20 mm.
D) 30 mm.

Question

Quizplus · Accepted Answer

The apparent depth is given by the formula: apparent depth = actual depth / refractive index. Rearranging gives actual depth = apparent depth * refractive index = 20 mm * 1.5 = 30 mm.

A Medal in a Plastic Cube Whose Index of Refraction