Name the defect of vision he is suffering from

A child is able to read his book comfortably but is unable to read the matter written on the blackboard at certain distance.
(a) Name the defect of vision he is suffering from.
(b) With the help of labelled ray diagrams, show:
(i) the above mentioned defect of vision. (ii) correction of the above mentioned defect using a suitable lens.

(a) Myopia.