Object placed .......... of lens or mirror give infinite magnification

At focus

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At infinite distance

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Between

F_{1}

and

2 F_{1}

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2 F_{1}

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Solution

The correct option is A At focus
A lens or a mirror produces an image of the object, kept at its focus, at infinity.
Thus image distance ( $v$ ) would be infinite i.e. very large whereas object distance ( $u$ ) is finite.
Magnification of lens or mirror $m = \frac{v}{u}$ where $v >> u$
Hence the lens or mirror gives infinite magnification.

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