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 –

• A. $\sqrt{2}fold$
• B. 2 fold
• C. $2\sqrt{2}fold$
• D. 4 fold

Answer 1

Answer: (D)

4 fold

Answer 2

time of exposure µ