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The image of a small dot fixed on the wall of a room is to be obtained on the opposite wall 4 m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose?

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3 m

4 m

2 m

1 m

answer is D.

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Detailed Solution

$\begin{array}{l} d \geq 4 f \\ f \leq \frac{d}{4} = \frac{4 m}{4} \\ f \leq 1 m \end{array}$

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