Ray Optics and Optical Instruments

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



1) $\sqrt{2}$ fold
2) $2$ fold
3) $2\sqrt{2}$ fold
4) $4$ fold
Solution: Explanation: No Explanation
Human Eye and Lens Camera

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