Question

a person cannot see objects kept beyond 2m distinctly find the power
and nature of correcting lens

Answer 1

The person has myopia

Power = 1 /f

= - 1 /2

= - 0.5 dipotre

Negative because we are using concave lens

Answer 2

A person when not able to see the far object suffers from eye defect called myopia.

Here, u (far point) = 2m= 200cm

v = infinite

By lens formula,

1/f=1/v-1/u

1/f= 1/infinite - 1/200

1/f = - 1/200

f= -200 cm

Now, power is reciprocal of its focal length.

So, P=100/f(cm)

P=100/200

P=1/2 D

P=0.5 D

We use concave lens to correct this defect of vision.

I hope it will help u buddy.

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