Question

A person can not see the objects clearly placed at a distance more than 40 cm. He is advised to use a lens of power

• A. – 2.5 D
• B.
  • 2.5 D
• C. – 6.25 D
• D.
  • 1.5 D

Answer 1

Answer: (A)

– 2.5 D

Answer 2

$f = - 40 \mathrm {~cm}$ and