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A slide projector has to project, a \( 35 \mathrm{~mm} \) slide ( \( 35 \mathrm{~mm} \times 23 \mathrm{~mm} \) ) on a \( 2 \mathrm{~m} \times 2 \mathrm{~m} \) screen at a distance of
\( \mathrm{P} \) \( 10 \mathrm{~m} \) from the lens. What should be the focal length of

W the lens in the projector?
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