Q4 of 234 Page 279

What type of lens is used to correct

(a) hypermetropia


(b) myopia?

(a) The type of lens which is used to correct hypermetropia is convex lens.

(b) The type of lens which is used to correct myopia is concave lens.


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2

Name the defect of vision in a person;

(a) whose near point is more than 25 cm away.


(b) whose far point is less than infinity

 3

Which defect of vision can be rectified:

(a) by using a concave lens ?


(b) by using a convex lens?

 5

What is the other name for

(a) myopia


(b) hypermetropia?

 6

What is the scientific name of

(a) short-sightedness, and (b) long-sightedness?