A student sitting at the back of the classroom cannot read clearly the letters written on the blackward. What advice will a doctor give to her ? Draw ray diagram for the correction of this defect.

Explanation

The student is suffering from myopia or near-sightedness. In myopia, one can see nearby objects clearly but cannot see distant objects distinctly.
The doctor advices a concave lens of suitable power to bring the image back onto the retina.
The ray diagram for the correction of this defect is shown below