Camera lens

The lens in your digital camera has a diameter of \( 2.5 \text{ mm,} \) and according to the manufacturers' specifications, its f-number is \(“ \text{F} 4.0 ”.\) The lens is held a certain distance away from the detector in order to produce a well-focused picture of a flower that is \( 15 \text{ cm} \) 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?

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