Q4 of 36 Page 327

Write true or false for the following statements:

Convex lens can be used to correct long-sightedness.

True.

Those who deal with long sightedness have difficulty seeing things that are near to them, but have better vision for objects that are far away. Therefore a Convex lens can be used for the remedy of this defect because it is converging lens, hence will form an image on the retina as shown in the figure below.



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2

Write true or false for the following statements:

A near sighted person can see only nearer objects.

 3

Write true or false for the following statements:

Presbyopia is a type of far sightedness.

 5

Write true or false for the following statements:

To correct astigmatism we use cylindrical lens.

 6

Write true or false for the following statements:

Short-sightedness is caused due to elongation of the eyeball.