Camera lens

Electricity and Magnetism Level 3

The lens in your digital camera has a diameter of 2.5 mm, 2.5 \text{ mm,} and according to the manufacturers' specifications, its f-number is “ F 4.0 ” . “ \text{F} 4.0 ”. The lens is held a certain distance away from the detector in order to produce a well-focused picture of a flower that is 15 cm 15 \text{ cm} away. You then turn to take a picture of a distant landscape. How far must the lens be moved, and in which direction, in order to obtain a well focused picture of the landscape?

1.42 mm 1.42 \text{ mm} farther from the detector. 1.42 mm 1.42 \text{ mm} closer to the detector. 0.71 mm 0.71 \text{ mm} closer to the detector. 0.71 mm 0.71 \text{ mm} farther from the detector.

Srinivasa Satti by Srinivasa Satti

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