$A$ child sitting in a classroom is not able to read clearly the writing on the blackboard.
$(a)$ Name the type of defect from which his eye is suffering.
$(b)$ With the help of a ray diagram show how this defect can be remedied.

(N/A) The child's eye is suffering from the defect of myopia (near-sightedness).
$(b)$ This defect can be corrected by using a concave lens of suitable focal length. The concave lens diverges the incoming parallel rays from a distant object,making them appear to originate from the child's far point,thus allowing the eye lens to focus the image on the retina. The ray diagram for the correction of myopia is shown below.