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 also
(ii) For its correction.
As the student is unable to see clearly the words written on the blackboard at a distance of 4 m, the student is suffering from myopia or near-sightedness.
This defect is corrected with concave lens of suitable focal length is used. The image is allowed to form at the retina by using a concave lens of suitable power.
Ray diagrams for the (i) defect of vision and (ii) for its correction:
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