Lesson 2

Requires these items from the kit: a motor, wires, battery band, disks and light wands.
Students will also need a battery and crayons or markers.

What are the primary colors of light?
How do you create the secondary colors?
How can mixing red with green possibly make yellow?
Mix light by spinning color wheels. Combine beams of color from LEDs.

1 What did you do last time? 2 light prism light sources reflect eye rainbow PRINT the word next
to the image on the next slide.
3
L-Lesson 2 eye lig rain pri sou ref
One more thing! Oops! 5 Your eyes are
LIGHT detectors.
6 You split white light
into a rainbow of colors.
Unlike Humpty-Dumpty,
you CAN put the colors of the rainbow
back together again. Let's give it a try!
7 On to mixing together colors of light!
Find your light kit and a clean surface.
When you are ready, go to the next slide.
8 Find these items in your kit: Battery
Band
motor 1.5 Volt
battery
alligator
leads
9 Wrap the battery band
around the battery.
Attach the alligator
clips to the battery.
1 2
10 Can you feel
the shaft spinning?
Now, disconnect
one alligator lead.
Connect the motor
to the battery, as shown.
3
11 5 4 Push the disk on to the shaft.
Connect the motor. Watch the disk spin.
pattern disk Color one of the disks
in the kit using markers
or crayons.
12 How close did the spinning disk get to WHITE? Newton's
Color Wheel
Try using ALL seven
colors in the rainbow.
If the colors are balanced, the disk
will appear white as you spin it with the motor.
If not, the disk may appear tan or gray or even pink.
13 PRIMARY COLORS are those colors that can be added together
to make all the other colors.
PRIMARY COLORS The PRIMARY COLORS for light may surprise you. You MIXED or ADDED colors
by spinning them together with a motor.
14 PRIMARY COLORS for light are: red blue green R G B 15 All the colors you see
on television screens,
computer monitors,
tablets and cell phones
are made
by ADDING together different amounts of these
primary colors of light!
R G B
16 Mixing LIGHT is very different
than mixing paints or food coloring.
Color each disk,
as shown.
1 2 3 Combine the colors by spinning each disk on the motor. red+green=yellow
green+blue=cyan
red+ blue=magenta
Did you see yellow,
cyan and
magenta?
yellow cyan magenta yellow cyan magenta
17 What do you think will happen
if you spin a disk colored
red, green and blue?
HINT: What is at the center
of this color wheel where
red, green and blue overlap?
Click to Watch Animation
18 Spinning each colored disk,
actually fooled your brain
into ADDING the colors together.
Markers and crayons are colored with pigments.
Pigment colors are not as exact as light colors.
Find the light wand in your kit.
Let's mix light colors using LED lights.
19 Remove the battery tab. Turn on your light wand.
The wand has 3 LEDs: red, green and blue.
The first three settings are: red, green and blue.
ONE LED IS ON AT A TIME.
Which two LEDs
make yellow?
Which two LEDs
make magenta?
Which two LEDs
make cyan?
20 You can use the color wheel to answer the questions
on the previous slide.
OR, point the tip of the light wand
at a white surface.

You can see the LED colors that are ON for each color in the tube.
Which LEDs must be on
to get PURE white?
Click for Animation
21

Introduction
Lesson 1
Lesson 2
Lesson 3
Lesson 4
Lesson 5
Lesson 6
Lesson 7
Lesson 8
Lesson 9
Lesson 10
Resources

 



Complies with NGSS:

NGSS 1.Waves: Light and Sound
1-PS4-1, 1-PS4-3, 1-PS4-4
(for more on 1-PS4-1 see Sound)

Core Disciplinary Ideas:
PS4.A Wave Properties;
PS4.B Electromagnetic Radiation;
PS4.C Information Technologies and Instrumentation

Mechanics, Waves & Energy: Light
Learn about the fundamentals of light: lenses, reflection, refraction, microscopes, telescopes, cameras, and the speed limit of the universe.