A camera objective has an aperture diameter d . If the aperture is reduced to diameter d 2 , the exposure time under identical conditions of light should be made

Question

A camera objective has an aperture diameter d . If the aperture is reduced to diameter d 2 , the exposure time under identical conditions of light should be made, 2 fold, 2 fold, 2 2 fold, 4 fold

MARKS App · Accepted Answer

For camera, time of exposure ∝ 1 A p e r t u r e 2 ¸ Therefore t 2 t 1 = d 1 d 2 2 t 2 t 1 = d d 2 2 = 4 t 2 t 1 = 4 Therefore exposure time under identical conditions of light should be made 4 fold

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