For a Simple Converging Lens of Ordinary Glass, the Focal

Multiple Choice

For a simple converging lens of ordinary glass, the focal length for red light is related to the focal length (call it f_b) for blue light by the relation

A) larger than the focal length for blue light.
B) equal to the focal length for blue light.
C) less than the focal length for blue light.
D) None of the previous answers is correct.