Question

a person can't see objects beyond 2m distinctly. state the nature and focal length of the lens which could be used to correct his vision.
plzzzz solve it

Answer 1

This state of vision defect is called myopia
It can be rectified using concave lens
The far point X =-2m
F=-x= -2
Power of lens =1/(-2m)
=-0.5 D

Answer 2

The person is unable to see things beyond 2 m it means he is suffering from myopia or short sightedness.

in this defect the person can see near by objects clearly but cannot see distinct objects distinctly.

The nature of the lens is concave lens.

Object distance = -infinnity

image distance =- 2 m

focal length = ?

1/f=1/v-1/u

1/f=1/-200-1/infinity

1/f=1/-200

1/f = -200cm
the focal length of the lens is -2 m