First slide

The optical instruments

Question

A person cannot see objects clearly beyond 2.0 m. The power of lens required to correct his vision will be

Moderate

A

+ 2.0 D
B

– 1.0 D
C

+ 1.0 D
D

– 0.5 D

Solution

$P = \frac{1}{f} = \frac{1}{- (defected far point)} = - \frac{1}{2} = - 0 .5 D$

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