Q2 of 234 Page 279

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

(a) The defect of vision in a person whose near point is more than 25 cm away is hypermetropia.

(b) The defect of vision in a person whose far point is less than infinity is myopia.


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60

Nocturnal animals (animals which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this.

 1

Name one of the common defects of vision and the type of lens used to remove it.

 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?