Thin Lenses and Curved Mirrors

Abstract

The passage of light through a thin converging lens is illustrated in Fig. 16.1. The light is refracted at both surfaces of the lens, but the rays emerge just as if they had suffered a single refraction at a plane somewhere inside the glass. For the purposes of ray constructions we represent a thin lens by a single line (AB in Fig. 16.1), where the refraction is considered to take place.