2. Light = straight path

3. An atom: emits light when an electron moves from a high to a low energy level. absorbs energy as its electrons move from a low to a high energy level.

4. The three primary colors of light are red, green, and blue.

5. The three primary pigment colors are: magenta, cyan, and yellow.

6. The primary colors used to construct an image on a color TV monitor are: red, green & blue.

7. Light can have different colors because it can have different: frequencies, wavelengths and energies

8. A laser is a device that emits a single frequency of light. X

9. The pictures represent the strength of signals reaching the brain from the color receptors in the eye. Filled boxes indicate a strong signal. Empty boxes represent no signal. NEXT 

10. Which picture represents someone seeing the color we think of as RED? as WHITE? as BLACK?

11. B = red A = white D = Black

12. We see a tree because of light __________ by the tree. reflected

13. Why is this cloth blue? The cloth absorbs all colors except blue; reflects only blue light to our eyes.

14. Filters absorb some colors & transmit others as light passes If white light through a red filter the filter allows the passage of  Absorbs all the colors except red….red passes through

16. If a laser printer mixes yellow & magenta pigment on the paper, it produces: red

17. The dotted line perpendicular to the surface is called the: NORMAL

18. The angle of incidence is identified as: B

19. Ray #2 is called the: reflected ray

20. A converging lens changes the direction of light through the process of: refraction

21. rays of light cross after they have been bent by a converging lens at the focal point.

22. In the picture below, the person sees the fish image in a different location than the actual fish because: The light rays reflected from the fish bend at the surface of the water.

23. The index of refraction best describes: the ability of a material to bend light rays. Materialn Vacuum1.00 Air1.0003 Water1.33 Plastic1.49 Glass1.56 Diamond2.41

24. A light ray strikes a lens parallel to the axis of the lens. Which of the following rays best represents the path of the light ray as it leaves the lens? Ray a

25. The human focuses on objects that are near & far away because: the lens changes shape

26. Types of Lenses

27. A fiber optic, (or light pipe) traps and transmits light inside its core as pictured in the diagram. The light is trapped because of total internal reflection.