A person cannot see distinctly at the distance less than one metre. Calculate&#x

Question

A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm
[CPMT 1977; MP PET 1985, 88; MP PMT 1990]

Options:

A . + 3.0 D

B . + 0.125 D

C . - 3.0 D

D . + 4.0 D

Answer: Option A
:
A

P = \frac{1}{f} = \frac{1}{v} - \frac{1}{u} .

Applying sign convention,

P = \frac{1}{f} = \frac{1}{- 100} - \frac{1}{- 25} = \frac{3}{100} = + 3 D .

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