Question

A student suffering from myopia is not able to see distinctly the objects placed beyond 5 m. List two possible reasons due to which this defect of vision may have arisen. With the help of ray diagrams, explain

(i) why the student is unable to see distinctly the objects placed beyond 5 m from his eyes.

(ii) the type of corrective lens used to restore proper vision and how hi defect is corrected by the use of this lens.

Answer 1

(i) The student is unable to see distinctly the objects placed beyond 5 m from his eyes as he is suffering from myopia i.e., near-sightedness wherein a person can see nearby objects clearly but cannot see distant objects distinctly. 

(ii) The concave lens can be used as the corrective lens to restore proper vision. A concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected.