First slide

Ray optics

Question

A certain person has a minimum distance of distinct vision of 150cm. He wishes to read at a distance of 25cm. What focal length glasses should he use?

Moderate

A

+ 40 cm
B

+ 30 cm
C

- 30 cm
D

- 40 cm

Solution

$\frac{1}{f} = \frac{1}{v} - \frac{1}{u}; \frac{1}{f} = \frac{- 1}{150} + \frac{1}{25} \Rightarrow f = 30 cm$

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