Question

A person cannot see object nearer than 50cm from his eyes while a person with normal vision can see object up to 25cm from his eyes. Find the nature, focal length and the power of the correcting lens for the defective vision

Answer 1

nature-----》 convex lens

take v = -50 cm
u= -25cm
use,
1/f = 1/v- 1/u
1/f = 1/ -50 +1 /25
1/f = 1-2/ -50
f = 50 cm

use
p= 1/f in m

p = 100/ 50

p= 2 diopter

p=