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Question

The camera lens has an aperture of f and the exposure time is (1/60)s. What will be the new exposure time if the aperture become 1.4 f ?

A
146
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B
156
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C
172
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D
131
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Solution

The correct option is D 131
Aperture =f=f, Exposure Time 160160 sec.
Area of aperture =f2=f2,
Area α Exposure Timeα1exposuretime
New aperture =1.4f=1.4f area =1.96f2=1.96f2
Ratio of areas =1.96=1.96. Since area of aperture has increased thus exposure time will decrease in same proportion, i.e.,
New time =1(60/1.96)=131sec.=1(60/1.96)=131sec

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