Time of exposure for a photographic print is 10 seconds, when a lam...

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Time of exposure for a photographic print is 10 seconds, when a lamp of \( 50 \mathrm{~cd} \) is placed at \( 1 \mathrm{~m} \) from it. Then another lamp of luminous intensity I is used, and is kept
\( \mathrm{P} \) at \( 2 \mathrm{~m} \) from it. If the time of exposure now is \( 20 \mathrm{~s} \), the value of \( I \) (in cd) is

W
(A) 25
(B) 100
(C) 200
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