Light travels in straight lines. Shadows are formed when light is blocked by an object. The size and shape of shadows can change depending on the position of the light source and object. Reflection of light allows us to see objects when light bounces off their surfaces and into our eyes. Common examples of reflection include mirrors, water surfaces, and other shiny materials.
Light is a transverse, electromagnetic wave that can be seen by humans. The wave nature of light was first illustrated through experiments on diffraction and interference. Like all electromagnetic waves, light can travel through a vacuum. The transverse nature of light can be demonstrated through polarization.
Light is a transverse, electromagnetic wave that can be seen by humans. The wave nature of light was first illustrated through experiments on diffraction and interference. Like all electromagnetic waves, light can travel through a vacuum. The transverse nature of light can be demonstrated through polarization.
This is a powerpoint for a 3rd grade class about heat sources. It can be used as a game to determine what is a heat source and what isn't. It also discusses insulation.
In this power point presentation, we discuss about the light, the laws of reflection, how we are able to see things, about human eye and how human vision works. We also talk about application of reflection of light by discussing about periscope and kaleidoscope.
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Explore the captivating world of light with Class 8 Science Light curriculum. Delve into the properties, reflection, and refraction of light, and discover its role in forming images, vision, and natural phenomena. From the laws governing reflection to the wonders of the human eye, Class 8 Science Light sheds light on the fascinating science behind illumination. Unravel the mysteries of light and its applications in our everyday lives with comprehensive study materials and engaging lessons.
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2. What is the difference between your
shadow and your image in a mirror ?
When we stand facing away from the
Sun, we see our shadows on the
ground in front of us.
WHAT IS SHADOW ?
HOW DOES IT FROM?
3. At the end of this unit, you will learn
about :
How light travels ?
How shadows are formed and the factors
that cause the size and shape of a shadow
to change ?
The reflection of light, ray diagram and uses
of the reflection of light in everyday life.
4. How does Light Travel ?
Look through a
You can use a torch to see rolled paper to see
things in a dark room. Look object. What you
at how the light beam from see ?
the torch.
Now, bend the paper and
look through it again. Can you see the object ?
You cannot see the object through the bend rolled
paper because light from the object cannot pass
through it. This shows that light travels in a straight
line.
5. DID YOU KNOW ???
Light travels at a speed Many events or
of 300 000 km per phenomena show
second. At this speed, that light travels in a
light from sun reaches straight line.
the Earth within 9
minutes
The search light from
The beam of light
from
lighthouse
helicopter
The ray Of
the sun
7. How Shadow does formed ?
Can you different
sizes of shadow
from the same
objects ?
Let go for get
the
Answer….
A shadow is formed when light
from a light source is blocked
by an opaque or translucent
8. Size and Shape of Shadow
The size of a shadow can be changed by
changing :
• Distance between the light source and
the object
• Distance between the object and the
screen
9. Now , you know how to change the
shape of a shadow ?
The shape and of a shadow
can be change by :
• The position of the light
source
• The position of object
10. Bouncing Light
When you look at mirror, you
see your image in the mirror .
The light from a light source
falls on you. This light is
reflected into the mirror and
the mirror reflects the image
into your eyes
11. The reflection of light can
be shown in the form of a
ray diagram.
We can see light around us because light
from a source is reflected by object
12. Reflection of
light is very
important in
everyday life
Some objects reflect light
better than others. Mirrors
and aluminium foils are good
.
reflectors of light because
their surfaces are smooth
and shiny
13. Some of the example are shown :
Periscope Dental Mirror
Side Mirror Convex Mirror
14. CONCLUSION :
1. Light travels in a straight line.
2. A shadow is formed when light is blocked by an opaque or
translucent object.
3. The size of shadow changes according to :
Distance between object and light source
Distance between screen and object
4. The shape of a shadow change according :
The position of the light source
The position of the object
5. Light can be reflected.
6. We can see an object because light from a light source that falls
onto the object is reflected by object onto our eyes.