Uploaded by Michael Bautista

Dispersion-and-Scattering-of-Light

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SY 2022 – 2023 | CAMARINES SUR NATIONAL HIGH SCHOOL, LIBOTON ANNEX
WARM UP:
4 PICS, 1 WORD
Work out what the mystery
word is based on the theme
of the photos presented.
________
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_____
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LIGHT
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__________
4 PICS, 1 WORD
REFLECTION
4 PICS, 1 WORD
__________
4 PICS, 1 WORD
REFRACTION
4 PICS, 1 WORD
__________
4 PICS, 1 WORD
SCATTERING
4 PICS, 1 WORD
__________
4 PICS, 1 WORD
DISPERSION
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___________
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DIFFRACTION
4 PICS, 1 WORD
____________
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INTEFERENCE
REFLECTION
REFRACTION
SCATTERING
DISPERSION
DIFFRACTION
INTERFERENCE
PHENOMENA OF LIGHT
DISPERSION
REFRACTION
SCATTERING
DIFFRACTION
INTERFERENCE
PHENOMENA OF LIGHT
DISPERSION
DIFFRACTION
SCATTERING
INTERFERENCE
PHENOMENA OF LIGHT
DISPERSION
SCATTERING
DIFFRACTION INTERFERENCE
PHENOMENA OF LIGHT
DISPERSION
SCATTERING
PHENOMENA OF LIGHT
DISPERSION
SCATTERING
PHENOMENA OF LIGHT
OBJECTIVES
Differentiate dispersion from scattering
Explain how rainbows are formed
through dispersion of light.
Explain why the sky is blue through
scattering of light.
Conduct simple-hands on activities
showing the dispersion and scattering
of light.
OBJECTIVES
Differentiate dispersion from scattering
Explain how rainbows are formed
through dispersion of light.
Explain why the sky is blue through
scattering of light.
Conduct simple-hands on activities
showing the dispersion and scattering
of light.
GROUP ACTIVITY
• In this activity, you will be divided into 4
groups.
• Each group will be observing either
dispersion or scattering of light, depending
on what is assigned to them.
WORKING AREA
GROUP 3
GROUP 4
GROUP 1
GROUP 2
TEACHER’S TABLE
REMINDERS
• Proceed to your working area silently.
• Groupmates must respect one another and
members of other groups as well.
• Do not disturb other groups.
• Students must follow the directions correctly and
carefully.
• The students may call the teacher’s attention if
they have any queries.
CAUTION
This experiment uses objects that may cause harm
if improperly handled.
• Be careful when using sharp objects.
• Be careful when handling fragile objects.
• Avoid playfighting while conducting the
experiment.
• Stay focused and be aware of your
surroundings.
RUBRICS
RUBRICS
GROUP ACTIVITY
• Each group will be given 15 minutes to work
on their assigned activity.
• After 15 minutes has passed, the students
will report their findings in front of the class.
• Each group will be given 3
minutes to report their
findings.
GUIDE QUESTIONS FOR REPORT
For dispersion:
• What was the experiment about? What did
you do in your experiments?
• What is Dispersion of light?
• How are rainbows formed
through dispersion of
light?
GUIDE QUESTIONS FOR REPORT
For scattering:
• What was the experiment about? What did
you do in your experiments?
• What is Scattering of light?
• How does the scattering
of light explain why the
sky is blue/red?
DISPERSION
The phenomenon of splitting white light into its 7
component colors.
The band of colors produced when white light is
split is called a spectrum.
DISPERSION
HOW DOES DISPERSION HAPPEN?
When light passes through a
prism, it is slowed down
because it changes medium
(air to glass).
This change in speed causes
light to bend or refract.
HOW DOES DISPERSION HAPPEN?
The
greater
the
wavelength the heavier
the wave. The heavier the
wave the more energy
needed to move the wave
in a different direction.
As a result, the greater
the wavelength, less
refraction.
RAINBOWS & DISPERSION
Rainbows are formed
when
sunlight
is
dispersed by tiny water
droplets present in the
atmosphere.
The water droplets act
like small prisms which
refracts and disperses
light.
RAINBOWS & DISPERSION
Rainbows are formed
when
sunlight
is
dispersed by tiny water
droplets present in the
atmosphere.
The water droplets act
like small prisms which
refracts and disperses
light.
SCATTERING
Scattering is the absorption of light by tiny particles
of a medium and its reemission in a particular
direction.
SCATTERING IN OUR EVERYDAY LIVES
Sunbeams are created
due to a type of
scattering called TYNDAL
SCATTERING.
This happenes when the
suspended particles are
almost the same size as
the wavelength of light.
COLOR OF THE SKY
The color of the sky is
due to a type of
scattering
called
RAYLEIGH SCATTERING.
This happened when
the suspended particles
are much smaller the
wavelength of light.
COLOR OF THE SKY
RAYLEIGH LAW OF
SCATTERING
Intensity of scattered
light
is
inversely
proportional to the
fourth power of a wave.
When wavelength is longer,
less scattering occurs.
1
𝐼∝ 4
𝜆
COLOR OF THE SKY
Among
the
seven
colors
of
sunlight,
which one is scattered
the most?
BLUE INDIGO
VIOLET
COLOR OF THE SKY
When the sun is
directly above
us, blue light
scatters
more
and is absorbed
by our eyes,
thus we see a
blue sky.
COLOR OF THE SKY
At sunset, light
from the sun
travels farther,
scattering ALL
BLUE
LIGHT,
leaving only red
and orange light.
RECAP
What
have
learned today?
you
RECAP
“How will you apply your knowledge about the
dispersion and scattering of light in your
everyday lives?”
REAL LIFE APPLICATION
DISPERSION
AND
SCATTERING
CAN BE USED
IN INTERIOR
DESIGN.
REAL LIFE APPLICATION
It can also be
used
in
films/plays &
photography
to
create
added effects
and emotions.
Knowledge check!
In a 1/4th sheet of paper,
(1) differentiate dispersion from scattering;
and;
(2)Relate either dispersion or scattering to
how rainbows are formed or why the sky is
blue or red at different times of the day.
ASSIGNMENT
Search what light phenomena is responsible
for the following:
A) The formation of crepuscular rays
B) Blurry edges of shadows at longer
distances.
THANK YOU FOR
LISTENING!
COLOR OF THE SKY
Sun emits more blue light
than violet and indigo;
thus, sky appears blue.
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