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Question

A far-sighted person has his near point 50 cm, find the power of lens he should use to see at 25 cm, clearly.

A
+1D
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B
+2D
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C
2D
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D
1D
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Solution

The correct option is B +2D
Given: A farsighted person has his near point 50cm,
To find the power of lens he should use to see at 25cm, clearly.
Solution:
Distant objects need to be imaged at most 50 cm from the eye.
According to the given criteria,
u=25cm,v=50cm
Applying lens formula, we get
1f=1v+1u1f=150+1251f=1+250f=50cm=0.5m
The power of the lens he should use is,
P=1f=10.5=+2D

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