First slide

The optical instruments

Question

A short sighted person can see distinctly only those objects which lie between 10 cm and 100 cm from him. The power of the spectacle lens required to see a distant object is

Moderate

A

+ 0.5 D
B

– 1.0 D
C

– 10 D
D

+ 4.0 D

Solution

$f = - d = - 100 cm = - 1 m ∴ P = \frac{1}{f} = \frac{1}{- 1} = - 1 D$

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