Ray Optics and Optical Instruments

Question: The exposure time of a camera lens at the $\frac{f}{2.8}$ setting is $\frac{1}{200}$ second. The correct time of exposure at $\frac{f}{5.6}$ is

1) 0.4 sec

2) 0.02 sec

3) 0.002 sec

4) 0.04 sec

Solution:

Explanation: No Explanation

Human Eye and Lens Camera

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