A student always sitting at the back of the bench rows in a class, who has difficulty in reading. What could name of his defect of vision? Could you draw ray diagrams to illustrate the image formation of his eyes, when he is seated at the (i) back seat and also (ii) front seat. Could you state two possible reasons of his defect of vision. Could you explain the method of correcting this defect with the help of a ray diagram, if possible.

According to the question, when a student sitting at the back bench in a class has difficulty in reading. It could be his defect of vision of “Myopia Causes”.
The image formation of his eye towards blackboard when he is seated as (i) back seat and (ii) front seat. The possible two causes of this defect are:
(i) excessive curvature of the eye lens
(ii) elongation of eyeball.
This defect can be corrected by using a concave lens of suitable power. Ray diagram: