First slide

The optical instruments

Question

A person can not see the objects clearly placed at a distance more than 40 cm. He is advised to use a lens of power

Moderate

A

– 2.5 D
B

+ 2.5 D
C

– 6.25 D
D

+ 1.5 D

Solution

$f = - 40 cm and P = \frac{100}{- 40} = - 2 .5 D$

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