Q.

A lens (focal length 50 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?

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answer is 3.

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Detailed Solution

Size  of  image  =fθ=0.5×1×10−3=0.5  mm
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A lens (focal length 50 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?