Question

Given is a diagram showing a defect of human eye.

Study it and answer the following questions :

Name the type of lens used to correct the defect.

• A. $Convex$
• B. $Concave$
• C. $Bifocal$
• D. All of the above can be used

Answer 1

The correct option is A $Convex$

According to the given diagram, the defect is hypermetropia. Hypermetropia means long-sightedness and is caused when the image of a nearby object is formed behind the retina. One needs to use a converging lens to correct this defect.

By placing a convex (plus powered) lens in front of a hypermetropic eye, the image is focused correctly on the retina.