1. Day 11 5/24/11 Topic: Vision and Color
Objective: I will describe how colors are mixed for light and pigment.
Science Starter: List the colors of a rainbow & answer the following:
Why is white not one of the colors?
Why are they in certain order?
Why isn’t pink one of the colors?
Text Book Turn in, 20 min into class. < 10 min of class time.

2. Color and Light
When all the colors of the rainbow are combined, we do not see any one color. We see light without any color. We call this combination of all the colors white light The colors that make up white light are called visible light. There are other forms of light that we cannot see, such as infrared and ultraviolet light.

3. Color and Light Light comes in tiny bundles called photons,
Low Energy
High Energy
Light comes in tiny
bundles called photons,
each of which has its
own color. The lowest
energy photons are a
dull red and the highest
energy are a deep
purple.

4. Light is a Wave Light is also a wave. The frequency of the
wave is proportional
to its energy. Red has
the lowest frequency
and violet has the
highest frequency.

5. The Subtractive Primary Colors
Colored items &
paint pigment work by a
subtractive process
Certain colors are
absorbed/subtracted.
The colors we see
are reflected.
Sketch using color

6. The Additive Primary Colors
We perceive different colors as a combination of percentages of the three additive primary colors: red, green, and blue (RGB).
EX:
Stage Lighting
Computer/TV pixels
Sketch using color

7. Printers & CMYK process
The CYMK process is
another name for adding
pigments to make color.
The three pigments, cyan,
magenta, yellow, and
black are added in
different proportions.

8. Exit questions What is white light in terms of the other colors?
What are the three additive colors?
What color of visible light has the least energy? The most energy?
What are the three subtractive colors?
A green object reflects green light (T/F).
A blue object absorbs red & yellow (T/F).
A yellow object reflects red light (T/F).
A white object absorbs red light (T/F).
RGB
RED
Low Energy
High Energy
Magenta, Yellow, Cyan
And the remaining
colors of ROYGBIV
A white object reflects
ALL of ROYGBIV
which together makes
white light.