First slide

Ray optics

Question

A person cannot see objects beyond 2.0 m clearly. If he wants to see the distant objects clearly, the power of lens required to correct his defective vision will be

Moderate

A

-0.5 D
B

2 D
C

-2 D
D

0.5 D

Solution

$f o r a n o b j e c t a t i n f i n i t y a v i r t u a l i m a g e s h o u l d f o r m a t 2 m d i s \tan c e \frac{1}{\infty} - \frac{1}{2} = \frac{1}{f} f = - 2 m P = - 0.5 D$

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