2. IDENTIFICATION OF DATA
SCHOOL :
CLASS : VII
NO. OF STUDENTS : 30
AVERAGE AGE : 12+
TIME : 40 min
SUBJECT : GENERAL SCIENCE
TOPIC : REFLECTION OF LIGHT
TEXTBOOK : CLASS VII, NCERT SCIENCE TEXTBOOK
TEACHERNAME : ANUJA AGARWALLA
DATE :
3. GENERAL OBJECTIVES
▪ KNOWLEDGE : The pupils will be able to recall the definition
of scientific terms, facts, principles; state theorems, laws,
formulae, etc.; label diagrams, etc.
▪ UNDERSTANDING: The pupils will be able to explain terms,
facts; compare and illustrate phenomena.
▪ APPLICATION : The pupils will be able to analyze situations;
verify predictions; solve numerical problems.
▪ SKILL : The pupils will be able to handle objects, instruments;
rectify the defects; draw free hand graphs, etc.
▪ INTEREST : The pupils will be able to take scientific hobbies.
4. TEACHING POINTS
REFLECTIONOF
LIGHT
LAWS OF
REFLECTION
OF LIGHT
REGULAR AND
DIFFUSED
REFLECTION
❖ The pupils will be able to define reflection of light.
❖ The pupils will be able to state the laws of reflection of light.
❖ The pupils will be able to explain how a light is reflected through
a plane mirror.
❖ The pupils will be able to differentiate between regular and
diffused reflection.
❖ The pupils will be able to use the knowledge gained from
reflection of light in the new circumstances of daily life.
SPECIFIC OBJECTIVES
5. INTRODUCTION
In order to motivate the pupils and to create a learning
atmosphere, the teacher will ask the following questions to the
pupils –
▪ Can you see what is written on the blackboard ?
▪ By which sense do we see all things around us ?
▪ Can we see all the objects in dark also ?
▪ Can we see moon, stars also while dark ?
▪ How is seeing made possible ?
6. REFLECTION OF LIGHT
When light falls on a polished or shiny surface it
changes its direction. This is called reflection of
light.
7. Incident ray: The ray of
light falling on the surface.
Reflected ray: The ray
coming back after
reflection.
Normal: The perpendicular
line drawn at the point of
incidence(P).
Angle of incidence(i): The
angle between incident ray
and normal.
Angle of reflection(r): The
angle between normal and
reflected ray.
8. LAWS OF REFLECTION OF LIGHT
➢ The angle of incidence is equal to the angle of
reflection.
➢ The incident ray, the reflected ray and the normal at
the point of incidence all lie in the same plane.
9. REGULAR AND DIFFUSED REFLECTION
REGULAR REFLECTION : When
parallel rays of light fall on a
smooth surface, the reflected
rays are parallel. This is called
regular reflection. Images are
formed by regular reflection.
DIFFUSED REFLECTION: When
parallel rays of light fall on a
rough surface, the reflected
rays are not parallel. This is
called diffused or irregular
reflection. Images are not
formed by diffused reflection.
10. EVALUATION AND HOMEWORK
Answer the following :
1. How do we see various objects? Explain.
2. Explain the difference between regular and
irregular reflection of light.
Homework :
1. How will you explain the statement ‘we cannot see
the objects in a dark room’?
2. Explain the laws of reflection with diagram.
