A point source of light is kept at a distance of \( 15 \mathrm{~cm} \) from a converging lens, o...

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A point source of light is kept at a distance of \( 15 \mathrm{~cm} \) from a converging lens, on its optical axis. The focal length of the lens is \( 10 \mathrm{~cm} \) and its diameter is \( 3 \mathrm{~cm} \). A screen is placed on the other side of the lens,
\( P \) perpendicular to the axis of lens, at a distance \( 20 \mathrm{~cm} \) from it. Then find the area of the illuminated part of

W. the screen?
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