1. ACTIVITY1: Jumbled Words.
1
1. SCENCEINCANDE=
2. NESCENCELUMI =
3. PHOSRESCENCEPHO=
INSTRUCTIONS: Re-arrange the jumbled words to form the correct
words and describe the words you formed. (2pts each)
2. ACTIVITY1: Jumbled Words.
2
1. SCENCEINCANDE=
INSTRUCTIONS: Re-arrange the jumbled words to form the correct
words and describe the words you formed. (2pts each)
INCANDESCENCE
3. ACTIVITY1: Jumbled Words.
3
1. SCENCEINCANDE=
2. NESCENCELUMI =
INSTRUCTIONS: Re-arrange the jumbled words to form the correct
words and describe the words you formed. (2pts each)
INCANDESCENCE
LUMINESCENCE
4. ACTIVITY1: Jumbled Words.
4
1. SCENCEINCANDE=
2. NESCENCELUMI =
3. PHOSRESCENCEPHO=
INSTRUCTIONS: Re-arrange the jumbled words to form the correct
words and describe the words you formed. (2pts each)
INCANDESCENCE
LUMINESCENCE
PHOSPHORESCENCE
6. OBJECTIVES
1. Identifying the different sources of light and its
propagation;
2. Inferring the importance of light and how it is being
propagated; and
3. Listing the different instruments and classification
of sources that can detect the source of light by
completing the table. 6
At the end of the lesson, the students can identify and describe the different sources
of light and propagation by;
7. OPTICS
7
-A branch of physics
which involves the
behavior and properties
of light, including its
interaction with matter
and the construction of
instruments that used to
detect it.
8. LUMINOUS OBJECTS
8
.
-objects that emit or
send off their own light.
They tend to radiate
heats as an effect of
being luminous and can
store energy.
Examples:
sun, stars, light bulbs, lamps, lasers,
campfires
Examples: sun, stars, light bulbs, lamps, lasers, campfires
9. NON-LUMINOUS OBJECTS
9
-those that can’t emit their
own light. In order for us to
see them, a light from the
luminous object must be
reflected. It is also termed
as illuminated objects.
Examples:
moons, cars, buildings
Examples: sun, stars, light bulbs, lamps, lasers, campfires
11. INCANDESCENCE
11
.
-the emission of light by a solid
that has been heated until it
glows, or radiates light. When an
iron bar is heated to a very high
temperature, it initially glows red,
and then as its temperature rises
it glows white.
Examples: sun, stars, light bulbs, lamps, lasers, campfires
12. LUMINESCENCE
12
.
-the emission of light by a
substance not resulting from
heat; it is thus a form of cold-body
radiation. It can be caused by
chemical reactions, electrical
energy, subatomic motions, or
stress on a crystal.
Examples: sun, stars, light bulbs, lamps, lasers, campfires
13. The Classification of Sources
13
Incandescence Sources
Fluorescence Sources
Phosphorescence Sources
14. INCANDESCENCE SOURCES
14
.
-hot sources of light
because light production is
always accompanied by a
strong release of heat.
However as soon as the
heat source is removed, the
production of light ceases.
Examples: fireworks, light bulb
Examples: sun, stars, light bulbs, lamps, lasers, campfires
15. FLUORESCENCE SOURCES
15
.
-unlike incandescent sources,
fluorescent sources produce
light without a great release of
heat. Thus, they are called cold
sources of light. The color of
fluorescent light depends
principally on the nature of the
stimulated substance.
-Example, a fluorescent tube of gaseous
mercury produces a bluish-green light.
Examples: sun, stars, light bulbs, lamps, lasers, campfires
16. PHOSPHORESCENCE SOURCES
16
.
-can also be produced by
electrical, electromagnetic,
or chemical stimulation.
Releases light that lasts
longer than 10
nanoseconds.
-Example:
“glow-in-the-dark” toys.
Examples: sun, stars, light bulbs, lamps, lasers, campfires
17. 17
CHECK POINT
1. Two types of object
2. Light can be produced
through:
3. Three Classification of
Sources
20. GUIDE QUESTION
1. What did you observed in the first set up?
2. What did you observed in the second set up?
3. What did you observed in the third set up?
4. What can you conclude about light propagation in the different
object?
21. Light and Transparency
21
Transparent materials
-such as air, glass, water and clear
plastic permit the passage of light.
Opaque Materials
-such material that block the passage of
light.
Translucent Material
-material that allow small amount of light to
pass
Examples: sun, stars, light bulbs, lamps, lasers, campfires
22. Brightness of Light
22
Photometry
-branch of optics that deals with illumination and the amount of
brightness that a light source possesses.
Examples: sun, stars, light bulbs, lamps, lasers, campfires
-refers to the brightness of a light
source. It is expressed in the unit
candela (cd).
Luminous Intensity Luminous Flux
-luminous energy emitted from a light
source, expressed in lumens (lm)
23. INTEGRATION
23
We love the metaphor of shining light
in the darkness- because we all have
the ability to seek the light and be the
light.
For you, how can you be a light to the
people around you?
