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Question

A real object is placed in front of a convex lens of focal length f at its principal focus. Then the image is formed at

A
zero
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B
Infinity
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C
at a distance 2f
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D
at a distance f2
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Solution

The correct option is B Infinity
The object is placed at focus so u=f
For lens formula 1f=1v1u
1f=1v1f
1v=0

Hence, v=, the image is formed at infinity.

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