First slide

The optical instruments

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

Moderate

A

+ 3.0 D
B

+ 0.125 D
C

– 3.0 D
D

+ 4.0 D

Solution

$P = \frac{1}{f} = - \frac{1}{v} + \frac{1}{u} = - \frac{1}{100} + \frac{1}{25} = \frac{3}{100} = + 3 D$

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