Question

What is long sightedness? List two causes for development of long sightedness. Describe with a ray diagram, how this defect may be corrected by using spectacles

Answer 1

Long sightedness - Hypermetrophia

A person with this defect can see far objects clearly but cannot see near objects.

CAUSES :

* focal length of the eye lens is too short.

*eye ball has become too short.

CORRECTION : This defect can be corrected by using a convex lens of suitable power.