(i) Make a ray diagram to show how the eye defect- myopia is corrected by using a suitable lens. (ii) State two reasons due to which this eye defect may be caused. (iii) A person with myopic eye cannot see objects beyond a distance of 1.5 m. What is the power of the lens required to correct the problem?

(i) Make a ray diagram to show how the eye defect- myopia is corrected

1.	(i) Make a ray diagram to show how the eye defect- myopia is corrected by using a suitable lens. (ii) State two reasons due to which this eye defect may be caused. (iii) A person with myopic eye cannot see objects beyond a distance of 1.5 m. What is the power of the lens required to correct the problem?
Answer» Solution :(i) (ii) (a) Elongation of the eye BALL (b) Decrease in focal length of eye LENS. (iii) `u=oo, V=-1.5m` `P=(1)/(F)=(1)/(u)-(1)/(v)` `=(1)/(-1.5)=-0.66 D`