A small camera has a lens with focal length f15 mm has a, Ask an Expert

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A small camera has a lens with focal length f=15 mm has a movable lens that can be focused on objects as close as 20 cm or as far away as infinity (relative to f).

a.) What is the optimum distance from lens to film if the camera is set for infinity (i.e., s>>f)?

b.) What is the optimum lens-film distance if s=20 cm?

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