Question

The near point of long sighted person is 50 cm. what lens should be used in order to read from a distance of 25 cm in the spectacles find the power also of lens? ​

Answer 1

Answer:

In order for a person to see the object at 25cm clearly, the lens should make an image of the object at 25cm distance at a distance of 50 cm.

Hence, u=−25cm=−0.25m

v=−50cm=−0.5m

Thus, Power =  

f

1

​  

=  

v

1

​  

−  

u

1

​  

=−2D+4D=+2D

Explanation:

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