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A man cannot see clearly the objects bey...

A man cannot see clearly the objects beyond a distance of 20 cm from his eyes. To see distant objects clearly he must use which kind of lenses and of what focal length

A

100 cm, convex

B

100 cm concave

C

20 cm convex

D

20 cm concave

Text Solution

Verified by Experts

The correct Answer is:
D
`1/F=1/v-1/u,u=oo,v=-20cm`
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