A lens (focal length \( 50 \mathrm{~cm} \) ) forms the image of a distant object which subtends ...

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A lens (focal length \( 50 \mathrm{~cm} \) ) forms the image of a distant object which subtends an angle of 1 milliradian at the lens. What is the size of the image?
(A) \( 5 \mathrm{~mm} \)
(B) \( 0.5 \mathrm{~mm} \)
(C) \( 1 \mathrm{~mm} \)
(D) \( 0.1 \mathrm{~mm} \)
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