Question

A man wearing glasses of focal length +1 m cannot clearly see beyond 1 m
(a) if he is farsighted
(b) if he is nearsighted
(c) if his vision is normal
(d) in each of these cases

Answer 1

(d) in each of these cases

The man is wearing glasses of positive power (converging lens). Hence, he cannot see nearby objects clearly. In other words, he is farsighted. Since he cannot see beyond 1 m, he is nearsighted. If a person with normal vision wears glasses of focal length +1 m, then the person will not be able to see beyond 1 m.