Question

A student is unable to see clearly the words written on a black board placed at a distance of approximately 3m from him. Name the defect of vision the boy is suffering from.state the cause of this defect and explain the method of correcting it by ray diagram

Answer 1

Short sightedness or myopia I. e unable to see far objects clearly

The lens used is convenient with '-' power

Answer 2

Defect- myopia or near sightedness

cause- elongation of eyeball, abnormal shape of cornea/ eye lens