This document discusses color and light. It explains that the primary colors of light are red, green, and blue, and that combining them additively produces other colors or white light. Pigments produce color through subtraction - they absorb all colors except the one being reflected. The document also covers polarized light and how lenses can be oriented to either block or pass light. Review questions at the end test the reader's understanding of these concepts.

1. Color
By: Brady Johnson and Kayla Grainger

2. Objectives
We are going to learn how to:
● Recognize how additive colors affect
the color of light.
● Recognize how pigments affect the
color of reflected light.
● Explain how polarized light is formed
and detected.

3. What’s this about?
In this powerpoint, we are going to look at
color and pigments, and their relationship
to light.
We will also look at how light can be
polarized, and other short things about
light.

4. Additive Colors
Primary colors of light are added together
to produce a complementary color.
Primary colors of light:
● Red
● Green
● Blue

5. Additive Colors
● To get white light, you add a
complementary color with a primary
color.
Complementary Colors:
● Yellow
● Magenta
● Cyan

6. Additive Colors
Primary Colors:
● Red + Green= Yellow
● Red + Blue= Magenta
● Blue + Green= Cyan
Complementary Colors:
● Yellow + Blue = White
● Magenta + Green = White
● Cyan + Red = White

7. Video

8. Additive Colors
● You can make almost any color using the
primary colors of light.
● When you put all the primary colors of
light together, you will get white light.

9. The Color Wheel
http://www.absorblearning.com/media/ite
m.action?quick=90

10. Subtractive Colors
● When you see black light, that means that
all of the colors are being absorbed
● If you subtract from white light, the
resulting color will be the complement of
the one subtracted.
○ For example: When you subtract blue light
from white light, you are left with red and
green which equals yellow, it’s complement.

11. Subtractive Colors

12. Pigments
● A pigment is a material that selectively
absorbs colored light.
● When someone’s shirt is blue, it is blue
because it is absorbing every color but
blue. It is reflecting the color blue.

13. Pigments
● Pigments absorb light of a relatively wide
range of frequencies and reflect a wide
range as well
● A black pigment can be used to sharpen
an image.

14. Pigments

15. Polarized Light
● Polarized light is the filtering of light.
● The way light is filtered depends on the
way you turn different lenses.
● If you have one lense turned vertically and
the other turned horizontally, light will be
completely blocked.

16. Polarization
● If you turn both lenses horizontally or
vertically, light will shine straight
through.
● if you put a lenses diagonally between two
crossed lenses, the light will be filtered.

17. Polarization

18. Review Questions
1. What are the primary colors of light?
2.When you put all the primary colors of
light together, it will result in what color of
light?
3. What makes a shirt appear as the color
blue?

19. Review Questions
4. How do you block light from shining
when referring to polarization?
5. How do you let light shine through
completely when referring to polarization?

20. Review Answers
1. The primary colors of light are red, green,
and blue.
2. When you put all the primary colors of light
together, you will get white light.
3. The shirt is absorbing all the colors except
blue. It is reflecting blue light.

21. Review Answers
4. Cross the lenses with one turned
horizontally and the other turned
vertically.
5. Either have both lenses turned
vertically or both turned horizontally.

22. ???Any Questions???

23. Bibliography
● Light and Color @ The Franklin Institute. (n.d.). Light and Color @ The
Franklin Institute. Retrieved October 22, 2013, from
http://www.fi.edu/color/
● Light Waves and Color - Table of Contents. (n.d.). Light Waves and Color Table of Contents. Retrieved October 22, 2013, from
http://www.physicsclassroom.com/Class/light
● Hewitt, P. G., & Chiaverina, C. (2009). Conceptual physics: the high school
physics program. Boston, Mass.: Pearson/Prentice Hall.