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]

+ 3.0 D

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+ 0.125 D

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- 3.0 D

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+ 4.0 D

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Solution

The correct option is A + 3.0 D
$P = \frac{1}{f} = \frac{1}{v} - \frac{1}{u} .$
Applying sign convention,
$P = \frac{1}{f} = \frac{1}{- 100} - \frac{1}{- 25} = \frac{3}{100} = + 3 D .$

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[CPMT 1977; MP PET 1985, 88; MP PMT 1990]

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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]

The correct option is A + 3.0 DP=1f=1v−1u. Applying sign convention, P=1f=1−100−1−25=3100=+3D.

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]

The correct option is A + 3.0 D
$P = \frac{1}{f} = \frac{1}{v} - \frac{1}{u} .$
Applying sign convention,
$P = \frac{1}{f} = \frac{1}{- 100} - \frac{1}{- 25} = \frac{3}{100} = + 3 D .$