This document provides information about light and its behaviors. It defines light as a form of energy made up of photons, and discusses its main source from the sun. It describes transparent, translucent, and opaque objects. It then defines and provides examples of the four main behaviors of light: reflection, refraction, diffraction, and absorption. The goal is for students to understand what light is, be able to distinguish its four behaviors, explain light's importance, and demonstrate examples of its behaviors.
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2. With the aid of the instructional materials and some
discussion, students are expected to:
Define the meaning of light, and its behaviors;
Distinguish the 4 behaviors of light such as reflection, refraction,
diffraction, and absorption;
Explain how important light is, and;
Perform examples of the behaviors of light.
3.
4. What is Light?
• Light is a form of energy that made of
photons. Photons are the smallest unit
or the basic unit that makes up light to
be visible light.
• Light enables us to see things around
us. Its main source comes from the sun
travels through space , reaches earth,
and some of it turns to heat energy and
warms the earth’s air.
5. There are types of objects or mediums
which light emits. What are those?
6.
7. We describe certain objects which allow visible light to
travel through them.
Transparent Object
When light hits an object
and light passes through it.
Examples:
Air, glass, pure water,
some plastics.
8. There are certain objects that allow light to pass through partially. Meaning when
light strikes at this kind of objects, only some of the light passes through them and
these are called Translucent Objects.
Examples:
frosted glass shower door.
tinted car windows.
sunglasses.
single piece of tissue paper
vegetable oil.
9. There are certain objects, through which light cannot pass, and it
changes its path after hitting the object. It allows no light through it.
These objects are called
Wood
Stone
Metals
Concrete
Bricks
cardboard
Opaque objects.
10. Light travels at about 186,000 miles per second,
which means it only takes eight minutes to reach
earth from the sun, 93 million miles away!
This speeding
light always
travels in a
straight line, until
it encounters a
different substance.
14. When the light travels through a boundary between two objects and
the light comes out at a different angle.
15. Refraction
This occurs when the light travels through a boundary between two
objects and the light comes out at a different angle.
16.
17.
18. Diffraction
The process of light bending around an obstacle or spreading out after it
moves through a small space.
19. Absorption
Process by which light is absorbed and converted into energy.
Light stops at the object and does not reflect or refract.
When light is absorbed it does not pass through or bounces from a
material. It remains in the material as another form of energy.
20. When light is absorbed it does not pass through or bounces from a
material. It remains in the material as another form of energy.
21. There are also objects that give out or emits light on their own called
Luminous objects.
Luminous sources are all around you, both man-made and in
nature.
Examples:
flame in a lamp.
tube light.
electric bulb.
22. There are also objects that do not have their own source of light energy
and hence they cannot emit light and are not responsible for vision, these
are called non-luminous objects. In fact they can be seen
because of the luminous objects.
Examples of non-luminous objects are the moon, plants, and spoons.
23.
24. Light travels at a lower speed in water than in air.
Image is formed by a mirror due to refraction of light.
When light hits an object and light passes through it, it is called Transparent
Object
Do we get sunburn from too much exposure to light absorb in
our skin?
25. Pictures presented are examples of
the behaviors of light. Guess what it
is?
Choices are: Reflection, Refraction, Diffraction, Absorption.
26.
27. A
B
A. The waves of light that can be reflected
off the object.
B. The waves of light that can be absorbed
by the object.
C. The wave of light that can be refracted
through the object.
D. The wave of light that can pass through
the object.
C
D
28. With the aid of the instructional materials and some
discussion, students are expected to:
Define the meaning of light, and its behaviors;
Distinguish the 4 behaviors of light such as reflection, refraction,
diffraction, and absorption;
Explain how important light is, and;
Perform examples of the behaviors of light.
29. That ends my presentation.
Thank you for listening.