Question

The near point of a person suffering from far - sightedness is 60cm. What will be the type of lens and its focal length to correct this defect of vision?

Answer 1

Answer:

Explanation:

It can be corrected by convex lens.

Given,

u= -25 cm

v= -60 cm

1/f = 1/v - 1/u

1/f = 1/-60 - 1/-25

1/f = 1/-60 + 1/25

= -5+12/300

= 7/300

f = 300/7

f = 42.85

Answer 2

Answer:

Convex lens is used to correct farsightedness