1. Name the defect of vision he is suffering from

CBSE Class 10 CBSE Class 10 Science
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1

A-14 year old student is not able to see clearly the questions written on the blackboard placed at a distance of 5 m from him.

  1. Name the defect of vision he is suffering from
  2. With the help of labelled ray diagrams, show how this defect can be corrected.
  3. Name the type of lens used to correct this defect.
  4. Name the possible cause of this defect.
2

1.The student is suffering from myopia.
2. Diagram for correction of myopia.

image
3. Concave lens is used to correct this defect

4.Possible Causes:

  • Decrease in the focal length of the eye lens.
  • Eye ball gets elongated.

5 image