Q5 of 234 Page 279

What is the other name for

(a) myopia


(b) hypermetropia?

(a) The other name for myopia is near sightedness.

(b) The other name for hypermetropia is far sightedness.


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3

Which defect of vision can be rectified:

(a) by using a concave lens ?


(b) by using a convex lens?

 4

What type of lens is used to correct

(a) hypermetropia


(b) myopia?

 6

What is the scientific name of

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

 7

What kind of lens is used to correct (a) short-sightedness (b) long-sightedness?