A student is unable to see clearly the words written on the blackboard placed at a distance of approximately 4 m from him. Name the defect of vision the boy is suffering from. Explain the method of correcting this defect. Draw ray diagram for the : (i) defect of vision and (ii) for its correction.

A student is unable to see clearly the words written on the blackboard

1.	A student is unable to see clearly the words written on the blackboard placed at a distance of approximately 4 m from him. Name the defect of vision the boy is suffering from. Explain the method of correcting this defect. Draw ray diagram for the : (i) defect of vision and (ii) for its correction.
Answer» SOLUTION :Myopia on short-sightedness : Inability of an eye in viewing long DISTANCE objects. The image in this case falls before the retina. For EVERY myopic eye, there exists a far point beyond which clear image cannot be SEEN. The short-sightedness is corrected by using a concave LENS which diverges and shifts the image to the retina.