Question

A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should he the type of the corrective lens used to restore proper vision?

Answer 1

concave lens is right

Answer 2

Answer:

The person should use a concave lens.  

We get that the far sight distance X = 1.2 M.

Therefore the person should use a concave lens that will have a focal length of -1.2 M.

Or we can say f = -x = -1.2 M.

Again the power of the lens the person need is 1 / (-1.2M) = -0.83 D.