A convex lens forms a clear, focused image of some small, fixed object on a screen. If
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A convex lens forms a clear, focused image of some small, fixed object on a screen. If the screen is moved closer to the lens, will the lens have to be
(a) moved closer to the object,
(b) moved farther from the object,
(c) left at the same location to produce a clear image on the screen at its new location? Explain your answer.
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