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Image Formation by Concave Lens

A slide proje...

Question

A slide projector has to project a $35 m m$ slide $(35 m m \times 23 m m)$ on a $2 m \times 2 m$ screen at a distance of $10 m$ from the lens. What should be the focal length of the lens in the projector.?

A

20

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B

17.19

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C

21

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D

22

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Solution

The correct option is B 17.19

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