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The distance between a convex lens and a...


The distance between a convex lens and a plane mirror is 10 cm. The parallel rays incident on the convex lens after reflection from the mirror forms image at the potical centre of the lens. Focal length of lens will be

A

`10 cms^(-1)`

B

20 cm

C

30 cm

D

Cannot be determined

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The correct Answer is:
b
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