Short Answer
The relative aperture or f -stop ( f ) for a camera lens is inversely proportional to the diameter of the aperture ( d ). An f -stop of 4 corresponds to an aperture diameter of 20 millimeters for the lens on an automatic camera. What is the f -stop of this camera when the aperture diameter is 10 millimeters?
Correct Answer:

Verified
Correct Answer:
Verified
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