Page 124 - Genius Kidz Prudence Learning Sc-8

The ray of light which is reflected off or comes Laws of reflection : There are 2 laws of
back from the surface is the reflected ray. reflection:

Normal is the ray that hits the surface at Law 1: The incident ray, the normal and the
perpendicular of 90°. reflected ray, at the point of incidence, all lie in
The angle that incident ray makes with the a same plane.

normal is called as angle of incidence. Law 2: Angle of incidence is always equal to
The angle that reflected ray makes with the the angle of reflection.
normal is called as angle of reflection. Ði=Ðr.

Activity 1

Design a simple activity to demonstrate laws of reflection with the help of your teacher and prepare a brief report
in the space provided.
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Multiple Images: The reflected light can again
be made to reflect by using this particular
reflected ray as an incident ray. This leads to
multiple reflections, these multiple reflections
can thus be used to make multiple images.

A very good example of multiple images can be
interpreted at a hair dresser shop when two
plane mirrors are used to visualize the hair cut.

Multiple images

1. Irregular or diffused reflection : It occurs when the reflecting surface is not
smooth. In this kind of reflection, reflected rays travel in different directions.
Examples of rough surface includes cardboard, human skin, etc.

2. Regular reflection : It occurs when the reflecting surface is smooth. In this
kind of reflection, reflected rays produced are parallel to each other.
Examples of smooth surface include glass surface, polished surfaces, etc.

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