1. Light is a particle and a wave and goes out in a straight line unless it bumps something.
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2. Light can be bent by gravity.

3. Refraction: The bending of a wave when it enters a medium where it's speed is different.
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5. An eagle must compensate for refraction when catching a fish.
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6. Diffraction: Bending of waves.
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7. Video! (Optional) Wave hitting a straight barrier in a ripple tank experiment in Japan.

9. Lens: A transparent optical device used to converge or diverge transmitted light and to form images.
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10. Copyright © 2010 Ryan P. Murphy

11. Convex
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12. Convex
Concave
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13. Convex
Concave
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14. Convex
“Get out of my cave.”
Concave
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15. Concavo-convex

16. Concavo-convex

17. Which a concave polygon?

18. Which a concave polygon?

19. Which a concave polygon?

21. Adjusting the lens, adjusts the focus and will allow to see more clearly.

22. Activity! Place the four dots on the focal point of each picture below.

23. Activity! Place the four dots on the focal point of each picture below.

24. Activity! Place the four dots on the focal point of each picture below.

25. Activity! Place the four dots on the focal point of each picture below.

26. Activity! Place the four dots on the focal point of each picture below.

27. Activity! Place the four dots on the focal point of each picture below.

28. Reminder to teacher! Reset focal points for next group.

29. Which is convex and which concave?
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30. Which is convex and which concave?
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31. Which is convex and which concave?
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32. These are both double convex, and double concave?
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33. These are both double convex, and double concave?
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34. Concave Mirror
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35. Convex mirror
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36. Which mirror is convex, and which mirror is concave?

37. Which mirror is convex, and which mirror is concave?

38. Which mirror is convex, and which mirror is concave?

39. Which mirror is convex, and which mirror is concave?

40. Which mirror is convex, and which mirror is concave?

41. Which mirror is convex, and which mirror is concave?

42. Which mirror is convex, and which mirror is concave?

43. For those who wear eyeglasses, the glasses help correct the focus point.
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44. Nearsighted
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46. Farsighted
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47. Which is nearsightedness, and which is far sightedness?

49. Farsightedness

50. Farsightedness Nearsightedness

51. Farsightedness Nearsightedness

52. Is this person nearsighted or far sighted?
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53. Answer! Farsighted
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54. Answer! Farsighted
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55. Activity! Vision test. Second to bottom row from the back of the room.
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56. Hubble Space Telescope.

58. Copyright © 2010 Ryan P. Murphy

59. Polarized Lenses:
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60. Polarized Lenses: Think of them as window blinds with slats.
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61. Polarized Lenses: Think of them as window blinds with slats
Polarized Lenses: Think of them as window blinds with slats.  Light travels in waves.  As the waves come to the slats, any waves that are not lined up with the openings in the slats are blocked out.
Copyright © 2010 Ryan P. Murphy