First slide

The lens

Question

A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side on its principal axis, the intensity of light

Easy

A

remains constant
B

continuously increases
C

continuously decreases
D

first increases then decreases

Solution

The parallel rays of light collect at the focus of the converging lens. Before reaching the focus, the rays converge, so the intensity increases. The intensity is maximum at the focus. The rays diverge after reaching focus. So the intensity decreases further.

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