Several laws of optics assumed without proof in a previous report dealing with calculations on the solar furnace are proved in detail. They are (1) that the fractional part of the light reflected at each point of reflection of a plane parallel glass plate is the same, (2) that the fractional part of the light refracted at each point of refraction of a plane parallel glass plate is the same, and (3) that the sum of the fractional part of the light incident on any surface of a plane parallel glass plate reflected therefrom and the frac¬tional part refracted therefrom is equal to unity. Finally the laws of reflection of a metallic surface with a glass superstrate are deduced.
展开▼
