10. $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500

11. Draw a ray.

13. How long do you have to wait to see in the dark?

14. Never will be able to see, nothing emitted

15. Describe the conditions necessary to see light

16. Has to reflect off an object and into your eyes

17. Draw the light rays emitted from one point on a candle.

19. How does a pinhole work? Draw the object and image.

21. What causes the formation of shadows?

22. When light shines on an object, some of the rays may be stopped while others pass on in a straight-line path

23. What is the difference between a shadow and a semi- shadow?

24. Shadow- clearly defined Semi-shadow- fuzzy, light can pass

25. Draw the shadow. Is it a shadow or a semi-shadow?

26. Shadow

27. Draw the shadow. Is it a shadow or a semi-shadow?

28. Semi-shadow

29. What is an eclipse? Provide an example, include a diagram

30. Solar eclipse: moon passes between earth and sun Lunar eclipse: earth passes between sun and moon

31. What is the law of reflection?

32. Angle of incidence = angle of reflection

33. How big a mirror do you need to see your entire body? Include a ray diagram.

34. A mirror half your height (diagram on board)

35. What is the normal? Why is it so important?

36. Normal = perpendicular to the surface; rays reflect about the normal

37. A 50 cm dog stands 3 m from a plane mirror and looks at its image. Draw a ray diagram for the dog. Describe the image.

38. Virtual, same size, same distance. Diagram on board

39. Describe the process of triangulation. Where is it used in your everyday life? Why is it necessary for our study of optics?

40. Triangulation = using multiple observers to pinpoint a source (ex: image location for a plane mirror, gps, satellite tv, etc)

41. What type of image can a concave mirror form?

42. Real or Virtual depending on location in relation to focal point

43. Where is the focal point located for a convex mirror? What type of image is always formed?

44. Behind the mirror, virtual image

45. What type of mirror is this? Why is there a warning?

46. Convex, diverging light increases vision but decreases size of car

47. Locate the position, orientation, and type of image formed by an upright object held in front of a concave mirror of focal length +10 cm. The object distance is 54cm and is 10cm tall. Include a ray diagram.

48. d i = 12.27 cm M = - 0.23 h i = -2.3 cm

49. Locate the position, orientation, and type of image formed by an upright object held in front of a convex mirror of focal length (-35) cm. The object distance is 40cm and is 17cm tall. Include a ray diagram.

50. d i = -18.66 cm M = 0.46 h i = 7.93 cm

51. Describe how light bends as it changes mediums.

52. Bends towards the normal if entering a more dense medium, bends away from the normal if entering a less dense medium

53. Heather is snorkeling in Oahu’s Hanauma Bay when she looks up through the water at a palm tree on the shore. If the index of refraction of the water is 1.33 and Heather sees the palm tree at an angle of 45 degrees, at what angle is the palm tree really located with respect to the normal? Include a diagram.

54. n 1 sinø i =n 2 sinø r 1.33sin45=1sinø r Ø r = 70 degrees

55. Draw the refracted rays

56. Diagram on board

57. How do rainbows form? Draw a ray diagram!

59. Different wavelengths of colored light refract differently, becomes trapped

60. Why does the road look hazy on a hot summer day? Draw a ray diagram.

61. Hot air different density than cold air, refracts more. Diagram on board

62. What is the difference between concave and convex lenses?

63. Concave = diverging Convex = converging

64. When does a convex lens produce a real image? Draw a ray diagram.

65. When the object is located behind the focal point.

66. An object is 5 cm from a concave lens of (-15cm) focal length. The object is 15cm tall. Determine the distance, height, and magnification. Include a ray diagram.

67. d i = -3.75 cm M = 0.75 h i = 11.25 cm

68. An object is 15.4 cm from a convex lens of +19.7cm focal length. The object is 15cm tall. Determine the distance, height, and magnification. Include a ray diagram.

69. d i = -70.55 cm M = 4.58 h i = 68.7 cm

70. Describe how the human eye works. What does it mean to be nearsighted? To be farsighted? Draw a ray diagram for each.

71. Nearsighted: cannot see far Farsighted: cannot see near

72. Eyesight What type of lens will correct for nearsightedness? For farsightedness? Draw ray diagrams for each.

73. Concave (diverging) for nearsightedness Convex (converging) for farsightedness