Question

a person is able to see objects clearly only when these are lying at distance between 50 cm and 300 cm from his eyes what kind of defect of vision he is suffering from what kind of lenses will he is required to increase his range of vision from 25cm to infinity explain brief draw relevant Ray diagrams​

Answer 1

there is two questions in your one question

(a) The person is suffering from both myopia and hypermetropia. because The range of normal eye vision is 25cm to infinite. Hence the distance is 25cm to 300cm, I guess the person os suffering from both eye defects.

(b) The person requires bi-focal lenses to increase his range of vision. The upper part of the bi-focal lens is a concave lens which facilitates distant vision while the lower part is a convex lens which provides near vision

Answer 2

Answer:

he may be suffering from presbyopia