(i) What are the values of (a) near point and (b) far point of vision of a normal adult person? (ii) A person with a myopic eye cannot see objects beyond 1.2 m directly. What should be the type of the corrective lens used? What would be its power?

(i) What are the values of (a) near point and (b) far point of vision

1.	(i) What are the values of (a) near point and (b) far point of vision of a normal adult person? (ii) A person with a myopic eye cannot see objects beyond 1.2 m directly. What should be the type of the corrective lens used? What would be its power?
Answer» Solution :(i) (a) 25 cm, (b) Infinity. (ii) To correct, an OBJECTS at infinity has to be brought at an image to 120 cm. `(1)/(F)=(1)/(-120)-(1)/((-^(@)))=(1)/(-120)` `f=-120cm` `P=(100)/(-120)=(-5)/(6)D=-0.83D` A concave lens of focal length 120 cm and power `-0.83D` is to be used.