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A person can see clearly objects only wh...

A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In order to increase the miximum distance of distinct vision to infinity , the person has to use, will be

A

convex, +2.25 diopter

B

concave, -0.25 diopter

C

concavve, -0.2 diopter

D

convex +0.15 diopter

Text Solution

Verified by Experts

The correct Answer is:
B
`(1)/(v)-(1)/(u)=P`
`(1)/(-4m)-(1)/(oo)=P`
P=-0.25D
And lens is concave.
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