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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 f
Let 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±d24fd2
For real values of x,
d24fd
that is ,d4f
The minimum distance between an object and its real image in a convex lens is 4f.
hence,option C is correct.


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