Question

180. A man can see only between 75 cm and 200 cm. The
power of lens to correct the near point will be
(a) + 8/3 D
(b) + 3D
(c)-3D
(d)-8/3D​

Answer 1

Answer:

A-8/3D

Explanation:

By lense formula,1/f=1/u+1/v

Here,

u= -25cm

v= -75cm

;  1/f  =  1/-25 + 1/-75

f=25/2

pwer of required convex lense = P  =  100/f  =100/75/2 =  +8/3D