Condition Mirror Refractive Lens Concave Focal Length Positive Focal Length Negative. Image distance positive
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1 Comparison between mirror lenses and refractive lenses Condition Mirror Refractive Lens Concave Focal Length Positive Focal Length Negative Convex Focal Length Negative Focal Length Positive Image location Attitude of image Character of image On same side as object On opposite side from object Negative Image distance Positive Image distance Negative image distance Positive image distance Image distance positive Image distance negative Upright Inverted Virtual Real Image distance negative Image distance positive Upright Inverted Virtual Real 2/98
2 Do Now A ray of light traveling in air is incident at an angle of 40 on an air-crown glass interface. What is the angle of refraction for this light ray? n 1 sin 1 n2 sin sin sin sin n2 n
3 Unit 12 Review Geometric Optics
4 1. In the law of reflection the angle of incidence A. is always greater than the angle of reflection B. is always less than the angle of reflection C. depends on the index of reflection and the angle of reflection D. is always equal to the angle of reflection 4/98
5 1. In the law of reflection the angle of incidence A. is always greater than the angle of reflection B. is always less than the angle of reflection C. depends on the index of reflection and the angle of reflection D. is always equal to the angle of reflection 5/98
6 2. The reason that you see a streak of light from the surface of a lake is that A. The index of refraction of the water is greater than that of air B. Light bends into the water and then gets scattered out C. The surface of the water is rough D. The surface of the water is smooth 6/98
7 2. The reason that you see a streak of light from the surface of a lake is that A. The index of refraction of the water is greater than that of air B. Light bends into the water and then gets scattered out C. The surface of the water is rough D. The surface of the water is smooth 7/98
8 3. The name for reflection from a smooth surface is A. planar B. specular C. internal D. diffuse E. normal 8/98
9 3. The name for reflection from a smooth surface is A. planar B. specular C. internal D. diffuse E. normal 9/98
10 4. The kind of reflection that allows us to see objects is A. planar B. specular C. internal D. diffuse E. normal 10/98
11 4. The kind of reflection that allows us to see objects is A. planar B. specular C. internal D. diffuse E. normal 11/98
12 20 5. In the above diagram, the angle of incidence is A. 20º B. 50º C. 70º D. 90º 12/98
13 20 5. In the above diagram, the angle of incidence is A. 20º B. 50º C. 70º D. 90º 13/98
14 20 6. In the above diagram, the angle of reflection will be A. 20º B. 50º C. 70º D. 90º 14/98
15 20 6. In the above diagram, the angle of reflection will be A. 20º B. 50º C. 70º D. 90º 15/98
16 7. The angle of incidence can never be greater than A. 0º B. 45º C. 90º 16/98
17 7. The angle of incidence can never be greater than A. 0º B. 45º C. 90º 17/98
18 8. The angle of reflection can never be greater than A. 0º B. 45º C. 90º 18/98
19 8. The angle of reflection can never be greater than A. 0º B. 45º C. 90º 19/98
20 9. An image seen in a plane mirror is always A. upright and real B. upright and virtual C. inverted and real D. inverted and virtual 20/98
21 9. An image seen in a plane mirror is always A. upright and real B. upright and virtual C. inverted and real D. inverted and virtual Object Image 21/98
22 10. The magnification of an object in a plane mirror is A. <1 B. negative C. >1 D. 1 22/98
23 10. The magnification of an object in a plane mirror is A. <1 B. negative C. >1 D. 1 In the lab with the bolts behind the mirror, if the magnification of the image was not 1 then the image would not have looked as if it was part of the object. 23/98
24 11.For a plane mirror, if the object is 10m in front of the mirror, then the image is A. At the mirror B. Less than 10m in front of the mirror C. 10m in front of the mirror D. Less than 10m behind the mirror E. 10m behind the mirror F. More than 10m behind the mirror 24/98
25 11.For a plane mirror, if the object is 10m in front of the mirror, then the image is A. At the mirror B. Less than 10m in front of the mirror C. 10m in front of the mirror D. Less than 10m behind the mirror E. 10m behind the mirror F. More than 10m behind the mirror If you look at yourself in the mirror, how far away does your image appear to be? 25/98
26 12.For a spherical mirror with radius, r, the focal length, f is given by: A. f=2r B. f=r C. 2f=r 26/98
27 12.For a spherical mirror with radius, r, the focal length, f is given by: A. f=2r B. f=r C. 2f=r f Or, f=r/2 r 27/98
28 2 cm Object 3 cm Image 13.In the above diagram, the magnification is A. 0.5 B C. 1.0 D E. 1.5 F /98
29 2 cm Object 3 cm Image 13.In the above diagram, the magnification is A. 0.5 B C. 1.0 D E. 1.5 F M = h i = 3 = 1.5 h 2 o 29/98
30 2 cm Object 3 cm Image 14. In the above diagram, the image is A. virtual B. imaginary C. real 30/98
31 2 cm Object 3 cm Image 14. In the above diagram, the image is A. virtual B. imaginary C. real Whenever the image distance is positive, the image is real. For real images, the light rays really cross at the image. 31/98
32 2 cm Object 3 cm Image 4 cm 15. In the above diagram, the object distance is A. 2 cm B. 3 cm C. -3 cm D. 4 cm E. 6 cm 32/98
33 2 cm Object 3 cm Image 4 cm 15. In the above diagram, the object distance is A. 2 cm B. 3 cm C. -3 cm D. 4 cm E. 6 cm 33/98
34 2 cm Object 4 cm 3 cm Image 16. In the above diagram, the image distance is A. 2 cm B. 3 cm C. -3 cm D. 4 cm E. 6 cm 34/98
35 2 cm Object 4 cm 6 cm 3 cm Image 16. In the above diagram, the image distance is A. 2 cm B. 3 cm C. -3 cm D. 4 cm E. 6 cm d M = i = 1.5 d o d i = 1.5 d o = 1.5 4cm = 6cm 35/98
36 17. For mirror lenses, when the image distance is positive the image is A. virtual B. real 36/98
37 17. For mirror lenses, when the image distance is positive the image is A. virtual B. real 37/98
38 17a. For glass lenses, when the image distance is positive the image is A. virtual B. real 38/98
39 17a. For glass lenses, when the image distance is positive the image is A. virtual B. real 39/98
40 18. If an image is upright and formed by a single lens, it must be A. real B. virtual 40/98
41 18. If an image is upright and formed by a single lens, it must be A. real B. virtual 41/98
42 19. Do the light rays from a virtual image cross at the image location? A. Yes B. No 42/98
43 19. Do the light rays from a virtual image cross at the image location? A. Yes B. No 43/98
44 20. Can the light rays from a virtual image be focused on a screen? A. Yes B. No 44/98
45 20. Can the light rays from a virtual image be focused on a screen? A. Yes B. No 45/98
46 Object A B C D MIRROR 21. For the object above, which is a possible real image A. A B. B C. C D. D 46/98
47 Object A B C D 21. For the object above, which is a possible real image A. A B. B C. C D. D 47/98
48 Object B C A D 22. For the object above, which is a possible virtual image A. A B. B C. C D. D 48/98
49 Object B C A D 22. For the object above, which is a possible virtual image A. A B. B C. C D. D 49/98
50 23. You want an image that is both real and upright. You need to use A. A mirror lens B. A glass lens C. Neither will work 50/98
51 23.You want an image that is both real and upright. You need to use A. A mirror lens B. A glass lens C. Neither will work 51/98
52 24. The object and focal A B points are shown. Which is not a principle ray? A. A B. B C. C D. D C D 52/98
53 24.The object and focal A B points are shown. Which is not a principle ray? A. A B. B: Parallel to lens central axis C. C: Directly through center of lens D. D: Through the focal point C D 53/98
54 25.Shown above are two lenses with the same focal length. The object sizes are the same. The image size will be larger for A. The smaller lens B. The larger lens C. It will be the same for both lenses. 54/98
55 25.Shown above are two lenses with the same focal length. The object sizes are the same. The image size will be larger for A. The smaller lens B. The larger lens C. It will be the same for both lenses. 55/98
56 26.For a spherical mirror, light that travels through the center of the sphere reflects A. Parallel to the main axis B. Through the focal point C. Back on itself Center Focal 56/98
57 26.For a spherical mirror, light that travels through the center of the sphere reflects A. Parallel to the main axis B. Through the focal point C. Back on itself Center Focal 57/98
58 27.For a spherical mirror, light that travels through the focal point reflects A. Parallel to the main axis B. Through the focal point C. Back on itself D. Through the central point of the lens Center Focal 58/98
59 27.For a spherical mirror, light that travels through the focal point reflects A. Parallel to the main axis B. Through the focal point C. Back on itself D. Through the central point of the lens Center Focal 59/98
60 28.For a spherical mirror, light that travels parallel the main axis reflects A. Parallel to the main axis B. Through the focal point C. Back on itself D. Through the central point of the lens Center Focal 60/98
61 28.For a spherical mirror, light that travels parallel the main axis reflects A. Parallel to the main axis B. Through the focal point C. Back on itself D. Through the central point of the lens Center Focal 61/98
62 29.The boy is looking in the mirror. This mirror is A. Concave B. Convex 62/98
63 29.The boy is looking in the mirror. This mirror is A. Concave B. Convex 63/98
64 30.The boy is looking in the mirror. This focal length is A. Positive B. Negative 64/98
65 30.The boy is looking in the mirror. This focal length is A. Positive B. Negative 65/98
66 31. The boy is looking in the lens. This lens is A. Concave B. Convex 66/98
67 31.The boy is looking in the lens. This lens is A. Concave B. Convex 67/98
68 32.The boy is looking in the lens. The focal length is A. Positive B. Negative 68/98
69 32.The boy is looking in the lens. The focal length is A. Positive B. Negative 69/98
70 33.Snell s Law Relates to A. Reflection B. Refraction C. Diffraction D. Reflection and Refraction 70/98
71 33.Snell s Law Relates to A. Reflection B. Refraction C. Diffraction D. Reflection and Refraction n 1 sinθ 1 = n 2 sinθ 2 71/98
72 34.The index of refraction A. can never be 1 B. can never be greater than 1 C. can never be less than 1 72/98
73 34.The index of refraction A. can never be 1 B. can never be greater than 1 C. can never be less than 1 n = c Speed of light in vacuum v Speed of light in medium C is always >V 73/98
74 35.A high index of refraction corresponds to a A. slow speed of light B. high speed of light C. neither. The speed of light never changes. 74/98
75 35.A high index of refraction corresponds to a A. slow speed of light B. high speed of light C. neither. The speed of light never changes. n = c v 75/98
76 36.If a material has an index of refraction of 3.0, what is the speed of light in the material? A. 1x10 8 m/s B. 2x10 8 m/s C. 3x10 8 m/s D. 6x10 8 m/s E. 9x10 8 m/s 76/98
77 36.If a material has an index of refraction of 3.0, what is the speed of light in the material? A. 1x10 8 m/s B. 2x10 8 m/s C. 3x10 8 m/s D. 6x10 8 m/s E. 9x10 8 m/s n = c v 3.0 = 3x10 8 m / s v 8 v = 3x10 m / s = 1x10 8 m / s 3 77/98
78 air A B C n=1.5 D 37.Light is incident from air to glass as shown. Which arrow shows the direction of the light in the glass? A. A B. B C. C D. D 78/98
79 air A B C n=1.5 D 37.Light is incident from air to glass as shown. Which arrow shows the direction of the light in the glass? A. A B. B C. C D. D When going from lower index to higher index, the light bends TOWARD THE NORMAL 79/98
80 n=1.5 A B C air D 38.Light is incident from glass to air as shown. Which arrow shows the direction of the light emerging from the glass? A. A B. B C. C D. D 80/98
81 n=1.5 A B C air D 38.Light is incident from glass to air as shown. Which arrow shows the direction of the light emerging from the glass? A. A B. B C. C D. D When going from higher index to lower index, light always bends AWAY FROM THE NORMAL 81/98
82 39.Total internal reflection can occur when A. light travels from air to water B. light travels from water to air C. either A or B D. neither A or B 82/98
83 39.Total internal reflection can occur when A. light travels from air to water B. light travels from water to air C. either A or B D. neither A or B Total internal reflection requires that light goes from a higher index material to a lower index material. 83/98
84 A C B D 40.Light goes from air to glass as shown. Which arrow shows the path that it will leave the glass? A. A B. B C. C D. D 84/98
85 A B C C D 40.Light goes from air to glass as shown. Which arrow shows the path that it will leave the glass? A. A B. B C. C D. D 85/98
86 41.When light is incident on the glass, as shown A. refraction occurs B. reflection occurs C. both A and B 86/98
87 refraction reflectio reflection refraction 41.When light is incident on the glass, as shown A. refraction occurs B. reflection occurs C. both A and B 87/98
88 42.An object is 1 cm from a glass lens. The image is 2 cm on the other side of the lens. The focal length of the lens is. A. 1/3 cm B. 2/3 cm C. -2/3 cm D. 1 cm E. 3/2 cm F. -3/2 cm 88/98
89 42.An object is 1 cm from a glass lens. The image is 2 cm on the other side of the lens. The focal length lens is. of the A. 1/3 cm B. 2/3 cm C. -2/3 cm D. 1 cm E. 3/2 cm F. -3/2 cm = d o d i f = f 3 = 1 2 f f = /98
90 43.The critical angle is 49º for a particular type of glass. Light is incident from the glass to the air at an angle of 48º. Relative to the normal, the exit angle is A. Close to 0º B. Close to 42º C. Close to 48º D. Close to 90º 90/98
91 43.The critical angle is 49º for a particular type of glass. Light is incident from the glass to the air at an angle of 48º. Relative to the normal, the exit angle is A. Close to 0º B. Close to 42º C. Close to 48º D. Close to 90º 91/98
92 44.If the image distance is a positive number, the image is A. real B. virtual C. upright 92/98
93 44.If the image distance is a positive number, the image is A. real B. virtual C. upright 93/98
94 45.For a mirror lens, a positive focal length is A. concave B. convex 94/98
95 45.For a mirror lens, a positive focal length is A. concave B. convex 95/98
96 46.For a glass lens, a positive focal length is A. concave B. convex 96/98
97 46.For a glass lens, a positive focal length is A. concave B. convex 97/98
98 air θ 2 θ 1 47.Light is incident from air to glass. The sin(θ 1 )=0.6 and the sin(θ 2 )=0.3. The index of refraction of the glass is A. 1.0 B. 1.5 C. 2.0 D. 2.5 E /98
99 air θ 2 θ 1 47.Light is incident from air to glass. The sin(θ 1 )=0.6 and the sin(θ 2 )=0.3. The index of refraction of the glass is A. 1.0 B. 1.5 C. 2.0 D. E n 1 sin(θ 1 ) = n 2 sin(θ 2 ) = n = n /98
Geometric Optics. Ray Model. assume light travels in straight line uses rays to understand and predict reflection & refraction
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