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Q.

The exposure time of a camera lens at the f2.8 setting is 1200 second. The correct time of exposure at f5.6 is

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a

0.4 sec

b

0.02 sec

c

0.002 sec

d

0.04 sec

answer is B.

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Detailed Solution

Time of exposure ∝(f number )2⇒t2t1=5.62.82=4 t2=4t1=4×1200=150sec=0.02sec
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