Question

The far point of a myopic person is 80cm in front of the eye. What is the power of the lens required to enable him to see very distant object clearly

Answer 1

Answer:

The person is suffering from myopia and hence need a concave lens to correct the defect. The lens should be such that an object at infinity must form its image at the far point.

Hence, f=−80 cm=−0.8 m

The power of the lens can be obtained as:

P=

f

1

P=

(−0.8)

1

=−1.25 D