1. Light Coach Dave Edinger J. C. Booth Middle School Physical Science (8A)

2. Speed of light = 300,000,000 m/s OR about 187,500 mi/s

3. electromagnetic wave: a transverse wave that is partly electric and partly magnetic

4. visible light: light you can see ROY G BIV

5. Most materials absorb some frequencies and reflect the rest. The color you see is the light that is reflected.

6. Ex. If an object reflects red light but absorbs all other frequencies, then the object appears red.

7. If an object absorbs all frequencies of light, then it appears black.

8. If an object reflects all frequencies, then it appears white.

9. An object can only reflect frequencies that are present in the illuminating light.

10. Ex. Incandescent light is richer in frequencies toward the lower end of the spectrum, therefore, objects appear to be more red

11. Ex. Fluorescent lights tend to be richer in frequencies toward the higher end of the spectrum, therefore, objects appear more blue.

12. Together, all of the colors of the visible spectrum make white light (ex. sunlight) White light also results from the combination of red, green and blue.

13. What happens when certain waves of visible light are combined? primary colors of light: red, green and blue

14. red + green = yellow red + blue = magenta green + blue = cyan

16. Mixing pigment is different than mixing light!!!

17. As pigments are added together, fewer colors of light are reflected and more are absorbed.

18. primary colors of pigment: cyan, yellow, magenta

19. Reflection: the bouncing back of a wave ex. mirrors

20. Refraction: the bending of waves as they enter a new medium ex. eyeglasses, prisms