Question

A student sitting at the back bench in a class has difficulty in reading. What could be his defect of vision? Draw ray diagrams to illustrate the image formation of the blackboard when he is seated at the (i) back seat (ii) front seat. State two possible causes of this defect. Explain the method of correcting this defect with the help of a ray diagram.

Answer 1

A student sitting at the back bench who couldn’t read can be attributed to more than one reason.

If he finds difficulty in watching his teacher write something on the board, then he could have got shortsightedness. And if he finds difficulty in watching what is written on the board, then he must have developed long sightedness.

Answer 2

A student sitting at the back bench who couldn’t read can be attributed to more than one reason.

If he finds difficulty in watching his teacher write something on the board, then he could have got shortsightedness. And if he finds difficulty in watching what is written on the board, then he must have developed long sightedness.

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