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The camera lens has an aperture of f and...

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 1.4f ?

A

`(1)/(42)`

B

`(1)/(56)`

C

`(1)/(72)`

D

`(1)/(31)`

Text Solution

Verified by Experts

The correct Answer is:
D
Time of exposure `prop f^(2)`
`(1)/(60)xx(1)/(1)=(t)/(1.4^(2))rArr t=0.3266 s`
`t=(1)/(31)s`.
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