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# PPT - Light Class 8 Notes | EduRev

## Class 8: PPT - Light Class 8 Notes | EduRev

The document PPT - Light Class 8 Notes | EduRev is a part of the Class 8 Course Science Class 8.
All you need of Class 8 at this link: Class 8
``` Page 1

CHAPTER - 16

LIGHT
Page 2

CHAPTER - 16

LIGHT
1) What makes things visible :-
Light helps us to see objects. We cannot see objects in
the dark.
An object becomes visible when light emitted or
reflected by it reaches our eyes.
Page 3

CHAPTER - 16

LIGHT
1) What makes things visible :-
Light helps us to see objects. We cannot see objects in
the dark.
An object becomes visible when light emitted or
reflected by it reaches our eyes.
2) Reflection of light :-
When light falls on a polished or shiny surface it
changes its direction. This is called reflection of light.
Page 4

CHAPTER - 16

LIGHT
1) What makes things visible :-
Light helps us to see objects. We cannot see objects in
the dark.
An object becomes visible when light emitted or
reflected by it reaches our eyes.
2) Reflection of light :-
When light falls on a polished or shiny surface it
changes its direction. This is called reflection of light.
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.
Page 5

CHAPTER - 16

LIGHT
1) What makes things visible :-
Light helps us to see objects. We cannot see objects in
the dark.
An object becomes visible when light emitted or
reflected by it reaches our eyes.
2) Reflection of light :-
When light falls on a polished or shiny surface it
changes its direction. This is called reflection of light.
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.
3) Laws of reflection of light :-
The laws of reflection of light are :-
i) The angle of incidence is equal to the angle of reflection.
ii) The incident ray, the reflected ray and the normal at the
point of incidence all lie in the same plane.
i
r
Normal
Incident rays Reflected rays
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