Question

A person uses  +1.5 D glasses to have normal vision from 25 cm onwards. He uses a  +20 D lens as a simple microscope to see an object. What is the maximum magnifying power if he uses the microscope without glasses ?

(a) 8

(b) 9

(c) 10

(d) 11

Answer 1

Correct option (b) 9

Explanation:

Let d be the distance of near point of the person without glasses.

focal length of glasses,

Therefore, the near point of the person is 40 cm. Focal length of microscope,