PROPOSED LESSON PLAN
FOR THE FIFTH WEEK ENDING 14th OCTOBER, 2022
2022/2023 ACADEMIC
SESSION
SUBJECT: BASIC SCIENCE
CLASS: GRADE 9
AVERAGE AGE: 13+ YEARS
GENDER: MIXED
DURATION: 40 MINUTES
DATE: 10/10/2022
TOPIC: LIGHT ENERGY
SPECIFIC OBJECTIVES: By
the end of the lesson the students should be able to;
1.
explain light as a form of energy (Light rays, Beam Of Light, And Its Types,
Rectilinear Propagation Of Light Rays.
2.
discuss reflection of light;
3.
describe the pin-hole camera.
ENTRY BEHAVIOUR: The
students have seen light before but may not know that there is an energy
associated with it.
INSTRUCTIONAL
MATERIALS: Textbook, lesson note, laptop,
projector, marker, whiteboard.
INTRODUCTION: Question
post to the students.
Question 1:
What is light energy?
STEP 1: LIGHT AS A FORM
OF ENERGY
Light
is a form of energy which produces the sensation of vision. During daytime
light from the sun is present everywhere and it enables us to see.
Rectilinear propagation
of light is the phenomenon of light travelling in straight
lines.
STEP 2: REFLECTION OF
LIGHT
When
you look at a mirror, you see an image of yourself. This is due to reflection
of light. When light rays travelling through a medium reach the boundary of the
other medium, they turn back to the first medium. This is reflection of light.
Thus, reflection can be defined as
the bouncing off of light rays after incidence at a particular angle on a
surface.
·
The path along which light energy
travels in a given direction is called a ray
of light.
·
A collection of large number of rays of
light is called a beam of light. There
are three types of beams. (i) parallel beam in which the light ray are parallel
to one another (ii) convergent beam in which the rays meet at a point (iii)
divergent beam in which the light rays all come from a point and spread out.
·
Anything through which light energy can
pass (partially or wholly) is called an optical medium.
When
light falls on the surface of a material, a part of it may be reflected, a part
may be absorbed and a part may get transmitted.
Mirror
P M
Normal
A O
Q N
Reflection
Any smooth polished surface which can turn
back the light rays into the same medium is called mirror. Thus surface MN acts
as a mirror.
·
A ray of light, PO, which travels
towards the mirror is called incident
ray.
·
A ray of light, OQ, which bounces off
the mirror surface is called reflected
ray.
·
The point on the surface of mirror, MN,
where the incident ray strikes or the reflected ray bounces off is called point of incidence.
·
A perpendicular, OA, drawn at the point incidence
to the surface of mirror is called normal.
STEP
3: THE PIN-HOLE CAMERA
A pinhole camera is a simple camera without a
lens but with a tiny aperture-effectively a light-proof box with a small hole
in one side. Light from a scene passes through the aperture and projects an
inverted image on the opposite side of the box, which is known as the camera
obscura effect.
EVALUATION:
1.
Explain light as a form of energy (Light rays, Beam Of Light, And Its Types,
Rectilinear Propagation Of Light Rays.
2.
Discuss reflection of light;
3.
Describe the pin-hole camera.
SUMMARY/CONCLUSSION: Light
travels in a straight line. Reflection occurs through any smooth polished
surface. Reflection is the bouncing off of light rays after incidence at a
particular angle on a surface.
ASSIGNMENT:
1.
Explain light as a form of energy (Light rays, Beam Of Light, And Its Types,
Rectilinear Propagation Of Light Rays).
2.
Discuss reflection of light.
3. Describe the pin-hole camera.
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