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Question

# The minimum distance between an object and its real image in a convex lens is (f = focal length of the lens)

A
2.5 f
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B
2 f
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C
4 f
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D
f
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Solution

## The correct option is B 4 fLet the distance between the object and its real image formed by convex lens be d1.Let the distance of the object from lens be x,so,the image distance from the lens is (d-x).Then, x=d±√d2−4fd2 For real values of x, d2≥4fd that is ,d≥4fThe minimum distance between an object and its real image in a convex lens is 4f.hence,option C is correct.

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