Explain the following terms.
(a) Cataract
(b) Point of incidence
(c) Multiple reflections

Explanation

(a) Cataract is an eye defect in which eye lens becomes cloudy and it leads to gradual loss of vision.
(b) The point on the surface of the object at which the incident ray strikes is called the point of incidence.
(c) Two plane mirrors placed at an angle to each other result in the formation of mul tiple images. This is known as multiple reflections.