Question

The near point of a hypermetropic person is 50 cm. The focal length of a convex lens used in his spectaclesshould be :

Answer 1

hope it's clear..........

Answer 2

Answer:Given :- u = -25

v = -50

f = ?

Lens formula,

1/f = 1/v - 1/u

= 1/-50 + 1/25

= 1/50

so, f = 50 cm

power, p = 100/f

= 100/50

= +2D

Explanation: