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

remains constant

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continuously increases

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continuously decreases

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first increases then decreases

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Solution

The correct option is C first increases then decreases
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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Similar questions

Q. 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
(a) remains constant
(b) continuously increases
(c) continuously decreases
(d) first increases then decreases.

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