A person is not able to see distinctly the object placed at large distances but is able to read the matter written on a book comfortably. Name the defect of vision he is suffering from. State two causes for this defect. With the help of a ray diagram show how this defect can be corrected.
The person is suffering from myopia.This defect may arise due to:(i) excessive curvature of the eye lens, or (if) elongation of the eyeball.This defect can be corrected by using a concave lens of suitable power.