The document discusses the phenomenon of light reflection, explaining how mirrors create images through light reflection, with a focus on plane and spherical mirrors. It describes two types of reflection: regular reflection, occurring on smooth polished surfaces, and irregular (or diffused) reflection on rough surfaces. Additionally, it introduces key terms related to the reflection process, such as incident ray, reflected ray, and angles of incidence and reflection.

1. LIGHT ENERGY

2. We all have seen and used mirrors, when
you get ready to go to your school, you stand
in front of a looking mirrors to see yourself.
What you see in the looking mirror is actually
your image, which is formed due to reflection
of light from the looking mirrors. However,
mirrors can be curved also.
Have you ever seen different funny
images of yourself formed by different mirrors
placed in a room or in a shop?

3. These mirrors are spherical mirrors.
The image formed by a mirror depends
on its nature and position of the object.

4. A mirror, whether plane or spherical forms
images of objects due to the phenomenon of
reflection of light. In this chapter, We well study the
phenomenon of REFLECTION OF LIGHT.
REFLECTION OF LIGHT
When a light beam traveling in a
medium falls on a boundary leading into
another medium, a part of the incident light
bounces back into the original medium.

5. This bouncing back of light in the
same medium is called the
REFLECTION OF LIGHT.

6. There are two types of reflection
depending upon the nature of the
reflection surface.
These are as follows.
1. REGULAR REFLECTION : When a beam
of light falls on a smooth and highly polished
surface almost entire light gets reflected in
the same medium in a definite direction. This
means that all reflected rays are traveling
parallel to each other. This type of reflection
is called Regular reflection.

7. 2 DIFFUSED or IRREGULAR
REFLECTION
When a beam of light falls on
an opaque, rough and uneven
surface, the light gets reflected in
different direction. This type of
reflection is called Irregular or
diffused reflection.

8. TERMS RELATED TO REFLECTION
OF LIGHT:
Look at the fig. to
understand the terms
related to reflection
of Light

9.  Incident ray: It is the light ray which strikes.
the reflecting surface.
 Reflected ray: It is the light ray which.
bounces back after reflection from the
reflecting surface
 Point of incident : It is the point on the
reflecting surface where the incident ray
strikes.
 Normal : It is a perpendicular line drown on
the reflecting surface at the point of incident.

10.  Angle of incidence: It is the angle which
the incident ray makes with the normal
drown at the point of incidence .
 Angle of Reflection: It is the angle which
the reflected ray makes with the normal.