Time required for making a print at a distance of \( 40 \mathrm{~cm...

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Time required for making a print at a distance of \( 40 \mathrm{~cm} \) from a 60 watt lamp is \( 12.8 \) second. If the distance is decreased to \( 25 \mathrm{~cm} \), then time required in making the
\( \mathrm{P} \) similar print will be

W
(A) \( 15 \mathrm{sec} \)
(B) \( 10 \mathrm{sec} \)
(C) \( 5 \mathrm{sec} \)
(D) remains some.
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