Characteristic of light

1. Detailed Lesson Plan for Grade-7
Third Quarter 12/12/2016
Learning Competency
 Relate characteristics of light such as color and intensity to frequency and
wavelength (S7LT-IIIf-10)
I. OBJECTIVES
At the end of the lesson, the Grade 7 students will be able to do the following with
80% proficiency:
1. name the scientist who have great contribution in the study of the nature of
light;
2. classify the sources of light according to their kind (natural or artificial);
and
3. differentiate intensity and brightness
II. SUBJECT MATTER
Subject : Science
Topic : Characteristics of Light
References: DepEd. Science: Learner’s Material for Grade 7. pp. 37-39
: Abistado, Jonna M., Madriaga, Estrellita A., Mariano, Jan Jason M., Valdoz, Meliza
P., Science Links (Worktext in Science and Technology). Rex Book Store, Inc. pp.
280-282
Duration : 60 minutes
Resources Needed: Laptop, Projector, Chalk
III. PROCEDURE
Teacher’s Activity Student’s Activity
A. Daily Routine
1. Prayer
2. Greetings
3. Attendance
4. Sharing of Lesson Objectives
5. Recall
Let’s have a little review first about what you had
discussed with Ma’am Aimee last week. What
are the three medium where sound can travel?
What are the six characteristics of sound waves?
Sound has three frequency ranges, what are
those?
What are the three kinds of sound that we heard
in our daily lives?
The properties that sound wave exhibit are?
B. Activity/Motivation
Who among you play charade?
The three medium where sound can travel are
solid, liquid and gas.
The six characteristics of sound waves are
frequency, wavelength, amplitude, speed or
velocity, period and phase.
The three frequency ranges are infrasonic,
audible and ultrasonic.
The three kind of sound that we heard are
pleasant sound, loud and noise.
Reflection, Diffraction and Refraction.

2. Let’s have 2 groups, each group will send one
representative to pick the word he will act and
the rest of his group mates will guess the word.
The fastest group who guess the 5 words will be
the winner. 1 minute is the maximum time for
each word.
C. Lesson Proper
Base on those words that you had guess, what
do you think is our topic?
That’s right. We will discuss about light. There
were two theories on the basic nature of light.
What are those theories?
Very good. Kindly read what is Undulatory
Theory or Wave Theory of Christian Huygen.
Thank you. Sir Isaac Newton contradicted the
Wave Theory as he described light as a stream
of particles or corpuscles. Kindly read what is
Corpuscular or Emission Theory of Sir Newton.
Sir Isaac Newton believes that light behaves like
a particle while Christian Huygens believed that
light behaves like a wave. Which do you think
between Newton and Huygen is correct?
That’s right. Max Planck explained that light can
be a particle and can also be a wave or simply
light has a dual nature.
What are the common sources of light that we
use in everyday life?
Very good. Sources of light are classified as
natural and artificial. Among those sources that
you said, which of them are belongs to natural
source and which of them are belongs to artificial
source? Kindly write it on the board.
(Students who play charade will raise their
hands)
(The students will do the task and guess the
words: source, light, sun, bulb, flashlight, sun,
wave, particles)
Our topic is about light.
The two theories on the nature of light are the
Undulatory Theory and the Corpuscular
Theory.
Undulatory Theory explains that light has a
wave motion which start from a vibrating
body and is transmitted at high speed.
Corpuscular Theory explains that light
consists of tiny particles of matter emitted by
a source that travels only in a straight line
called rays.
Both of them are correct.
The common sources of light are sun, lamps,
bulbs, candles, flashlights, etc.
Natural Source Artificial Source
Sun
Lamps
Bulbs
Flashlight

3. Very good. Sun is also considered as a luminous
body. Kindly read what luminous body/object is.
The sun, stars, light bulbs, lamps, lasers, and
campfires are examples of luminous object.
Non luminous object on the other hand, are those
that cannot emit their own light. In order for us
to see them a light from luminous object must be
reflected. What are the examples of it?
Is there any question about sources of light?
In our daily life how we are able to see thing?
Intensity / brightness of light that we receive
depend on some factor. Watch carefully this
experiment video about the intensity of light.
Base on the video that you had watched, where
does the intensity of the light depend?
Anyone who wants to differentiate intensity of
light and brightness of light?
Very good. Are we clear with the difference of
the two?
Is there any question?
D. Generalization
Is light a particle or a wave?
Who is the proponent of Undulatory theory of
light?
Who is the proponent of Corpuscular theory of
light?
How about dual nature of light?
Again, what are the two classification of light
source?
Where does intensity of light depends?
E. Application
Candle
Luminous objects are objects that emit or send
off their own light. They tend to radiate heat
as an effect of being luminous and can store
energy.
The moon, cars, buildings, chairs, table, etc.
None ma’am.
We are able to see things because of the light
produced by the sun.
(The students will watch the video)
The intensity of light depends on the source
and the distance from the source.
Intensity is the absolute measure of a light
wave’s power density while brightness is the
relative intensity as perceived by average
human eye.
Yes ma’am.
None ma’am.
Light is both wave and particle.
Christian Huygen
Sir Isaac Newton
Max Planck
The two classification of light source are
natural and artificial light source.

4. What will happen to Earth without these sources
of light?
F. Valuing
Light is like the people around us specially our
parents/ our family. They are remarkable yet we
sometimes take them for granted. There are
times that we prefer to be with our friends than
to be with them knowing that they are always
there. But when the dark times of our lives
come, they are first person who will help us. Or
worst when they are no longer around, only then
you will realize how important they are to you.
Just like light, you only see its worth when
darkness comes.
The intensity of light depends on the source
and the distance from the source.
Without the light that the sun produces the
Earth will be a total darkness and coldness.
Without it there will be no life on Earth,
because it is the one that sustain life on Earth.
Without the artificial sources of light at night,
it would be hard for us to see things. It will be
difficult for us to navigate at night.
IV. Evaluation
Directions: In each question or incomplete statement choose the best answer from the four
suggested answers. Write the letter of your answer in a ¼ sheet of paper.
1. Who is the proponent of Undulatory Theory of Light?
a. Christian Huygens c. Galileo Galilei
b. Isaac Newton d. Max Planck
2. Who is the proponent Dual Nature of Light?
a. Christian Huygens c. Galileo Galilei
b. Isaac Newton d. Max Planck
3. The following are artificial sources of light EXCEPT ____________.
a. bulb c. flashlight
b. candles d. sun
4. What are the two classification of light source?
a. artificial and natural c. natural and fake
b. artificial and original d. natural and non-natural
5. ___________ is the absolute measure of a light wave’s power density while
___________ is the relative intensity as perceived by average human eye.
a. Brightness; intensity c. frequency; wavelength
b. Intensity; brightness d. wavelength; frequency

5. V. Assignment
On a ½ sheet of paper, enumerate the seven electromagnetic waves and their use.
Prepared by:
MACAHILOS, FLORENCE IVY C.
Student Teacher
Approved by:
MS. JENNY GRACE MORENTE
Supervising Instructor
MS. IMELDA S. COCHING
Master Teacher I