Q4 of 17 Page 214

State the laws of reflection.

The Laws of reflection are:

1) The angle of reflection is always equal to the angle of incidence.


2) The incident ray, the reflected ray and the normal to the reflective surface at the point of incidence all lie in the same plane.



More from this chapter

All 17 →
2

Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

 3

Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.

(a) Polished wooden table


(b) Chalk powder


(c) Cardboard surface


(d) Marble floor with water spread over it


(e) Mirror


(f) Piece of paper

 5

Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

 6

Fill in the blanks in the following.

(a) A person 1 m in front of a plane mirror seems to be ___________ m away from his image.


(b) If you touch your ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with your ___________.


(c) The size of the pupil becomes ___________ when you see in dim light.


(d) Night birds have ___________ cones than rods in their eyes.