Exposure time of camera lens at \( f / 2.8 \) setting is \( 1 / 200 \) second. The correct time ...

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Exposure time of camera lens at \( f / 2.8 \) setting is \( 1 / 200 \) second. The correct time of exposure at \( f / 5.6 \) is
(a) \( 0.20 \) second
(b) \( 0.40 \) second
(c) \( 0.02 \) second
(d) \( 0.04 \) second.
 
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