Q6 of 234 Page 279

What is the scientific name of

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

(a) The scientific name of short-sightedness is myopia.

(b) The scientific name of long-sightedness is hypermetropia.


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4

What type of lens is used to correct

(a) hypermetropia


(b) myopia?

 5

What is the other name for

(a) myopia


(b) hypermetropia?

 7

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

 8

State whether the following statement is true or false : Short-sightedness can be cured by using a concave lens.