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.
(a) Name the defect of vision he is suffering from.
(b) With the help of labelled ray diagrams, show how this defect can be corrected.
(c) Name the type of lens used to correct this defect.
OR
(a) What is an electromagnet?
(b) List any of its two uses.
(c) Draw a labelled diagram to show how an electromagnet is made.
(d) What is the purpose of the soft iron core used in making an electromagnet?
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a) He is suffering from myopia
b) ......
c) It can be corrected by using concave lens of suitable power
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