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Image Formation by Convex Lens

A lens when p...

Question

A lens when placed on a plane mirror then object needle and its image coincide at $15$ cm. The focal length of the lens is

A

15

cm

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B

30

cm

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C

20

cm

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D

\infty

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Solution

The correct option is A $15$ cm
When the object is placed at focus the rays are parallel. The mirror placed normal sends them back. Hence image is formed at the object itself as illustrated in figure.

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