The image of a tree on a 35 mm color slide is 17 mm high it, Ask an Expert

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The image of a tree on a 35 mm color slide is 1.7 mm high. It is to be projected onto a screen 8.0 m from the slide, and is to appear 559 mm high.

(a) What focal length lens (in meters) is needed?

(b) What is the distance in meters between the lens and the slide?

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