ColorBy: Brady Johnson and Kayla Grainger

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.

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.

Additive Colors

Primary colors of light are added together to produce a complementary color.

Primary colors of light:● Red● Green● Blue

Additive Colors

● To get white light, you add a complementary color with a primary color.

Complementary Colors:● Yellow ● Magenta ● Cyan

Additive ColorsPrimary Colors:

● Red + Green= Yellow● Red + Blue= Magenta● Blue + Green= Cyan

Complementary Colors:● Yellow + Blue = White● Magenta + Green = White● Cyan + Red = White

Video

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.

The Color Wheel

http://www.absorblearning.com/media/item.action?quick=90

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.

Subtractive Colors

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.

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.

Pigments

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.

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.

Polarization

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?

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?

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.

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.

???Any Questions???

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.