2.  Module 3 is all about visible light
 how common sources produce visible
light,
 the common properties and characteristics
of light,
 And how the eye sees color

3. Focus Objectives
Special characteristic of  Infer where colors come
visible light: Color from
 Visible light is the  Relate color to frequency
narrow range of and wavelength
frequencies and  Explain why objects
wavelengths that can be appear in a particular
seen by the human eye color
 The differences of  Appreciate proper
wavelengths within this lighting in doing various
range are perceived as activities.
differences in color

4. What I already What I want to What I learned
know about know
light
•What did you see?
• List the colors in order
• How does the acronym ROY G BIV help you describe
what you see?
•Where could thave these colors come from?

5.  Q1. Which color registers the highest frequency? shortest
wavelength?
 Q2. Which color registers the lowest frequency? longest
wavelength?
 Q3 What pattern do you notice about the wavelength and
frequency of the different colors?
 Q4. When you take the product of wavelength and
frequency, what do you get? What is the significance of
this value?
 Q5. What is a possible relationship between wavelength
and frequency? How would you prove this relationship?
 Q6. What can you say about the speed of the different
colors of light in air?

6. Q1. Which color registers the highest frequency? shortest wavelength?
Violet has the highest frequency and the shortest wavelength.
Q2. Which color registers the lowest frequency? Longest wavelength?
Red has the lowest frequency and the longest wavelength.
Q3 What pattern do you notice about the wavelength and frequency of
the different colors? Long wavelength colors have low frequencies.
Q4. What is a possible relationship between wavelength and frequency?
How would you prove this relationship? Wavelength and frequency
are inversely proportional. This can be proven by finding out whether
the product wavelength x frequency would equal a constant.
Q5. When you take the product of wavelength and frequency, what do
you get? What is the significance of this value? The product of
wavelength and its corresponding frequency is very close to 3 x 108m/s,
the speed of light in air.

7.  the visible spectrum Color Wavelength Frequency
λ THz(1012
consists of color nm (10-9 m) Hz
bands and
therefore are red 780 - 622 384 - 482
identified by a
range of orange 622 - 597 482 - 503
wavelengths and
yellow 597 - 577 503 - 520
frequencies to wit
green 577 - 492 520 - 610
blue 492 - 455 610 - 659
violet 455 - 390 659 - 769

8. Shine the flashlight on each filter and note the
color of light projected on the screen
 Q1. What is the color of the beam
transmitted by the filter?
 Q2. How does the color of the filter compare
to the color it transmitted?
 Q3. Write a general statement that describes
the color of the filter and the color it
transmits.

9. http://users.halpc.org/~clement/Simulations/Mixing%20Colors/rgbColor.html
 Primary colors for light  Primary colors for paint
: pigments
 RED
 Magenta
 GREEN  Yellow
 cyan
 BLUE

10.  For light  For paint pigments
Q4. Describe the color of
Magenta + yellow = ____
the overlap:
Yellow + cyan = ______
Red + blue = ______
Magenta + cyan = ______
Blue + green = ________
Magneta + cyan + yellow
Green + red = ________
= __________
Red + Green+ Blue = ____

11. http://www.cs.brown.edu/exploratories/freeSoftware/repository/edu/brown/cs/exploratori
es/applets/combinedColorMixing/combined_color_mixing_java_plugin.html)
 1. Click on the light bulb, paint can, and colored
filter icons located in the toolbar on the left side
to add them to the lab area. Clicking on an
object in the scene removes it from the scene,
while clicking on a projector specifies it as the
recipient of the next light bulb that is selected.
Clicking on the "Animate Beams" button
activates the projectors and the user can directly
observe how the selected items affect the color
of the light beams as they travel through the
scene.

13. Bulb Filter Paint Color we “see”:
Red Red Red
Green
Blue
Magenta
Cyan
yellow
Green Red
Green
Blue
Magenta
Cyan
yellow
Blue Red
Green
Blue
Magenta
Cyan
yellow

14.  White light can be split up to make separate colors.
These colors can be added together again.
 The primary colors of light are red, blue and green:
Adding blue and red Adding blue and green
makes magenta makes cyan (light blue)
(purple)
Adding red and Adding all three
green makes makes white
yellow again

15.  Filters can be used to “block” out different colors of light:
Red Filter
Magenta
Filter

16.  The color an object appears depends on the colors of
light it reflects.
For example, a red book only reflects red light:
White Only red light is
light reflected

17. A pair of purple trousers would reflect purple light (and red and
blue, as purple is made up of red and blue):
Purple light
A white hat would reflect all seven colours:
White
light

18.  If we look at a coloured object in coloured
light we see something different. For
example, consider a this pair of shirt and
shorts:
Shirt looks red
White
light
Shorts look blue

19.  In different colours of light they would look different:
Red
Shirt looks red
light
Shorts look black
Shirt looks black
Blue
light
Shorts look blue

20.  For light:  For pigments
 Primary colors:  The color of a
 Red transparent object is the
 Green color it transmits
 Blue  The color of an opaque
material is the color it
 Red+ blue = magenta reflects
 Blue + green = cyan
 Red + blue =yellow
 Red + blue + green =
white

21. Evaluate
red
black
red
blue
black

22. green blue green
red blue black