College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 48

A parallel beam of light enters a glass hemisphere perpendicular to the flat face, as shown in Figure P23.53. The radius of the hemisphere is R = 6.00 cm, and the index of refraction is n = 1.56. Determine the point at which the beam is focused. (Assume paraxial rays; i.e., assume all rays are located close to the principal axis.)