A parallel beam of light strikes a converging lens parallel to its principal axis. As a person moves away from the lens along the principal axis on the opposite side, the intensity of the light

Step-by-step solution

When a parallel beam of light passes through a converging lens, it converges at the principal focus. The intensity of light is given by the power per unit area, I = P A . As the person moves away from the lens and approaches the focus, the cross-sectional area of the converging beam decreases. This causes the intensity of light to increase, reaching a maximum at the focal point. As the person moves beyond the focus, the light beam diverges. The cross-sectional area of the beam increases, which causes the intensity