Reflection is the phenomenon of light bouncing back when it hits a shiny surface. We see images in mirrors and water due to reflection. The laws of reflection state that the incident ray, reflected ray, and normal all lie in the same plane, and the angle of incidence equals the angle of reflection. An activity can demonstrate this using a comb, torchlight, and paper.

1. REFLECTION

2. When light falls on a shiny surface, it bounces back this phenomenon is called reflection. We are able to see image in
mirror or in water because of reflection.
The process of sending back light rays fall which fall on the surface of an object is called reflection of light

3. LAWS OF REFLECTION

4. The ray of light which strikes the surface is called incident ray
The ray which comes back after reflection is called reflected ray
The perpendicular line drawn at the point of incidence is called normal
The angle between the normal and incident ray is called angle of incidence(<I)
The angle between the normal and reflected ray is called angle of reflection (<r)
The angle of incidence is always equal to the angle of reflection.

5. Suppose you are in a dark room. Can you see
objects in the room ? Can you see object
outside the room ?

6. The relation between the incident ray, the reflected ray and the normal is given as the laws of reflection
The laws of reflection are as follows :
The incident ray, the reflected ray and the normal at the point of incidence , all lie in the Same plane.
The angle of incidence(<I) is equal to the angle of reflection (<r)

7. When we see ourselves in a mirror, it appears that our image is actually behind the mirror. This is
illustrated in Figure. We see the light coming from a direction determined by the law of reflection.
The angles are such that our image is exactly the same distance behind the mirror as we stand away
from the mirror. If the mirror is on the wall of a room, the images in it are all behind the mirror.

8. Take a white sheet of paper and place it on the table
Let the sheet be a little outside the edge of the table
Take a comb and close all its opening except the middle
Hold the comb perpendicular to the sheet of paper
Now through light of the torch from through the opening of the comb
We can see the incident and the reflected ray on the white sheet
Now we make the normal
Using a scale , we cut the sheet from point of incidence
We can see that incident ray, reflected ray and normal lie on the chart paper. They are not up or below the
chart paper
Hence, incident, reflected and normal all lie in the same plane

9. •Explain what is reflection of light ?
•What is incident ray ?
•What is angle of incidence ?
•What are the laws of reflection ?
•Describe an activity to show reflected ray, incident ray and the normal at the
point of incidence
•What is the first law of reflection
•What makes thing visible ?