1. 18.4 Color Opener #5 - Thursday - March 11, 2010 Show all work or use complete sentences to answer the following questions: Section 17.3 pg. 512 #6-8. Electromagnetic Spectrum Review from 8th grade...

2. 18.4 Color This student is looking at many colors on his computer screen. What he is actually seeing, however, are combinations of only three colors of light.

3. 18.4 Color How does a prism separate white light? Separating White Light Into Colors As white light passes through a prism, shorter wavelengths refract more than longer wavelengths, and the colors separate.

4. 18.4 Color Sunlight is made up of all the colors of the visible spectrum. A prism separates white light into a visible spectrum. When red light, with its longer wavelength, enters a glass prism, it slows down the least of all the colors. Red light is bent the least. Violet light is bent the most. Separating White Light Into Colors

5. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Dispersion of Light Chapter 18 Color - light Click below to watch the Visual Concept. Visual Concept http://my.hrw.com/sh/hk6_0030390966/student/ch1 5/sec04/vc02/hk615_04_v02fs.htm

6. 18.4 Color The process in which white light separates into colors is called dispersion. A rainbow forms when droplets of water in the air act like prisms. When light enters a raindrop, it slows down and refracts. Then it reflects off the far inner surface of the raindrop. It refracts again as it exits the raindrop, speeds up, and travels back toward the source of the light. Separating White Light Into Colors

7. 18.4 Color A. The shorter wavelengths are bent more than the longer wavelengths. The colors are separated. B. Water droplets separate the colors of sunlight, producing a rainbow. Separating White Light Into Colors

8. 18.4 Color The following Java Applet is on refraction of light. I want you to experiment some with it by observing the affect of white light and the changes in incident compared to the change in refraction. Besides changing the mediums with white light, I want you to experiment with some monochrome color and then adjust the color of light to see if it has any affect. Also notice the change in wavelength as you change colors. http://micro.magnet.fsu.edu/primer/java/scienceopticsu/refraction/index.html

9. 18.4 Color What determines the color of an object? The Colors of Objects The color of any object depends on what the object is made of and on the color of light that strikes the object. Wait for the video to play...

10. 18.4 Color An object’s color is the color of light that reaches your eye when you look at the object. Sunlight contains all the colors of the visible spectrum. The Colors of Objects A red car in sunlight reflects mostly red light. Most of the rest of the light is absorbed at the surface of the paint.

11. 18.4 Color What happens if you change the color of the light shining on an object? Only the colors that are in the light can be reflected. The Colors of Objects

12. 18.4 Color Under white light, the pots appear white, green, yellow, red, and blue. The pots appear to be different colors when viewed in different colors of light, depending on what light is reflected. The Colors of Objects

13. 18.4 Color Under white light, the pots appear white, green, yellow, red, and blue. The pots appear to be different colors when viewed in different colors of light, depending on what light is reflected. The Colors of Objects

14. 18.4 Color Under white light, the pots appear white, green, yellow, red, and blue. The pots appear to be different colors when viewed in different colors of light, depending on what light is reflected. The Colors of Objects

15. 18.4 Color Under white light, the pots appear white, green, yellow, red, and blue. The pots appear to be different colors when viewed in different colors of light, depending on what light is reflected. The Colors of Objects

16. 18.4 Color What are the primary colors of light? Primary colors are three specific colors that can be combined in varying amounts to create all possible colors. Mixing Colors of Light The primary colors of light are red, green, and blue.