7.4 COLOURED LIGHT
REVISION
21-09-20
Visible Light
& Color
OBJECTIVE:
To identify the different colors of the visible
light and compare each of its frequency and
wavelength.
Essential Question:
• How do we perceive colors?
1. What is visible light?
-smallest part of the EM spectrum that the
human eyes can see
Red to Violet (ROYGBIV)
What are the different colors of visible
light?
• Red – lowest energy, longest
wavelength
• Orange
• Yellow
• Green
• Blue
• Indigo
• Violet – highest energy, shortest
wavelength
ROY G BIV
Which color has the
most energy and
short/small
wavelength???
Color
Violet
the
HIGHEST energy…
and SHORT
wavelength
Which color has the
lowest energy and
long/big wavelength???
Color
Red
the LOWEST
energy… and LONG
wavelength
What happens when you
wear WHITE on a hot
day?
How do we get white?
2. White light
ALL the colors
ROY G BIV
being
REFLECTED
What happens when you
wear BLACK on a hot
day?
How do we get black?
3. Black
ALL colors of rainbow being
ABSORBED.
Example: Fashion
Fall/Winter Colors
Spring/Summer Colors
4. How do we see color?
4. HOW DO WE SEE COLORS?
First, light goes from the source (sun, lamp,
etc.) to the object.
Second, the color we see is reflected and
the rest is absorbed by the object.
WHITE
When all colors
are REFLECTED
We see WHITE
BLACK
When all colors
are ABSORBED
We see BLACK
Summary
• Answer the essential question:
How do we perceive color?
Summary
• Answer the essential question:
How do we perceive color?
Light from sun reflects off object
and we see the color that is
reflected.
Color Balloon Toss
Light & Color!
Review
When white light hits an object, all the
colors are absorbed except for the color of
that object.
Example:
Blue – All colors absorbed except blue,
which is reflected to eye.
White – No colors are absorbed.
All colors are reflected to eye. (white light)
Black – All colors are absorbed.
No colors are reflected to eye.
Activity Instructions
For this activity, you will be given a
colored balloon. You will see objects of
various colors on the screen.
If the color you have is absorbed by the
object, you need to cover the balloon with
your body. DON’T POP IT!!
If the color you have is reflected by the
object, you need to reflect the balloon into
the air above you.
Confused?
It’s okay…let’s give it a shot.
All colors are absorbed except…
Let’s get started…
Pay close attention
to the MAIN color
LAST ONE…
Get Ready!!!