Which of the following type of lens is used to correct the vision of a near sighted individual ?

Options

A. biconcave
B. biconvex
C. convex
D. all of the above

Answer

A

Explanation

Anterior-posterior diameters of eyeballs vary. A long eye is considered near-sighted or myopic, light rays come to focus before they reach the retina, therefore, a concave lens if needed for correction. A short eye results in far-sightness or hypermetropia, light rays would come to focus in back of the retina and, therefore, a convex lens is needed for correction.