MHT CET 2024 Physics question

A convex lens of focal length 'f' m forms a real, inverted image twice in size of the object. The object distance from the lens in metre is

(A)0.5 f
(B)0.66 f
(C)f
(D)1.5 fCorrect

Answer: (D)

Solution

Use the Cartesian sign convention: for a real inverted image the magnification is , so (with , ). Lens formula gives , i.e. , so . The object distance

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Question ID VK-093014