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A clown 1.6 m tall looks at himself in a full-length mirror (floor-to-ceiling). Where in the mirror must he look to see

1. 2. 3. 4. 5. A clown 1.6 m tall looks at himself in a full-length mirror (floor-to-ceiling). Where in the mirror must he look to see his feet?. 20 cm from the floor 1.2 m from the floor at the top of the mirror 0.8 m from the floor 53 cm from the floor.

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A clown 1.6 m tall looks at himself in a full-length mirror (floor-to-ceiling). Where in the mirror must he look to see

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  1. 1. 2. 3. 4. 5. A clown 1.6 m tall looks at himself in a full-length mirror (floor-to-ceiling). Where in the mirror must he look to see his feet? • 20 cm from the floor • 1.2 m from the floor • at the top of the mirror • 0.8 m from the floor • 53 cm from the floor

  2. A concave mirror has a focal length of 29 cm. What is the position (in cm) of the object if the image is upright and three times larger than the object? • 38 • 58 • 19 • 20 • 39

  3. A concave mirror has a focal length of 19 cm. What is the position (in cm) of the resulting image if the image is inverted and four times smaller than the object? • -39 • 14 • 48 • 24 • 76

  4. A convex mirror has a focal length of {image} 19 cm. What is the position of the resulting image (in cm) if the image is upright and four times smaller than the object? • -23 • -22 • -32 • -43 • -16

  5. 1. 2. 3. 4. 5. A concave mirror has a focal length of 24 cm. What is the magnification if the object's distance is 89 cm? • {image} • {image} • {image} • {image} • {image}

  6. 1. 2. 3. 4. 5. A concave mirror has a focal length of 60 cm. What is the magnification if the object and image distances are 36 cm and {image} 90 cm respectively? • {image} • {image} • {image} • {image} • {image}

  7. 1. 2. 3. 4. 5. A convex mirror has a focal length of -19 cm. What is the object distance if the image distance is -10 cm? • 32 cm • 30 cm • 42 cm • 66 cm • 21 cm

  8. A concave mirror has a radius of curvature of 1.3 m. An object is placed 1.9 m in front of the mirror. Determine the location of the image (in cm). • 77 • 48 • 99 • 410 • 85

  9. An object 5 cm high is placed 17 cm in front of a convex mirror with a focal length of -11 cm. What is the image position (in cm)? • 30 • -3 • -2 • -30 • -7

  10. An object is placed 11 cm in front of a concave mirror with a 25-cm focal length. Determine the image location (in cm). • -21 • 7.6 • 51 • -13 • -20

  11. An object 13 cm high is placed 14 cm in front of a convex mirror with a focal length of -10 cm. What is the image height (in cm)? • 2 • 20 • 30 • 5 • 8

  12. 1. 2. 3. 4. 5. An object is placed 17 cm in front of a concave mirror with a focal length of 35 cm. What is the magnification? • {image} • {image} • {image} • {image} • {image}

  13. A dentist uses a concave mirror (focal length 4.3 cm) to examine some teeth. If the distance from the object to the mirror is 2.1 cm, what is the magnification of the tooth? • 9 • 1 • 2 • 1.5 • 4

  14. The actual depth of a shallow pool 2.7 m deep is not the same as the apparent depth seen when you look straight down at the pool from above. How deep (in cm) will it appear to be? {image} • 45 • 150 • 359 • 200 • 88

  15. Bottles of perfume sometimes have thick glass (n = 1.4) walls which give the impression the volume is larger than it is. Assume a cylindrical bottle has an inner radius of 1.0 cm and an outer radius of 1.7 cm. How thick (in cm) would the wall appear if you could see a mark on the inside surface? • 0.86 • 1.7 • 2.3 • 0.92 • 0.61

  16. 1. 2. 3. 4. 5. Bottles of perfume sometimes have thick glass (n = 1.6) walls which give the impression that the volume is larger than it really is. Assume a cylindrical bottle with an inner radius of 1.0 cm and an outer radius of 2.1 cm. What percentage of the apparent volume is the real volume? • 46% • 83% • 69% • 56% • 39%

  17. A plane convex lens is made of glass (n = 1.4) with one flat surface, and the other having a radius of 21 cm. What is the focal length (in cm) of the lens? • 20 • 38 • 84 • 53 • 50

  18. An object 18-cm high is placed 50 cm in front of a lens whose focal length is 4.9 cm. Where will the image be located (in cm)? • 6.73 • 5.43 • 4.46 • 6.62 • 5.11

  19. An object 55-cm high is placed 1 m in front of a converging lens whose focal length is 1.5 m. Determine the image height (in cm). • 18 • 170 • 92 • 33 • 60

  20. An object is placed 15 cm in front of a diverging lens whose focal length is 10 cm. Where will the image be located (in cm)? • -30 • -4.6 • -5.0 • -6.0 • -6.7

  21. A camera has a converging lens with a focal length of 51 mm. If the f-number is 2.6, what is the diameter of the lens (in mm)? • 38 • 31 • 20 • 130 • 140

  22. The purpose of prescription glasses for a near-sighted person is to bring distant objects _____ . • to the far point of the eye • to the retina of the eye • to the near point of the eye • none of the above

  23. A far-sighted student has a near point of 1.5 m. Calculate the focal length (in cm) of the glasses needed so the near point will be normal (25 cm). • 27 • 21 • -30 • 80 • 30

  24. A 11-cm focal length converging lens is used to magnify small newspaper print 1.7 mm high. Calculate the height of the image (in mm) for the maximum magnification for a normal eye. • 5.6 • 3.9 • 9.4 • 2.6 • 2.8

  25. A compound microscope is made with an objective lens {image} and an eyepiece {image} The lenses are separated by a distance of 10 cm. If an object is 1.0 cm in front of the objective lens, where will the final image of the eyepiece be located? • -17 cm • -6 cm • -29 cm • -23 cm • -11 cm

  26. A compound microscope is made with an objective lens {image} and an eyepiece {image} The lenses are separated by a distance of 10.8 cm. What is the overall magnification? (Assume the near point is 25.0 cm.) • -596 • -180 • -257 • -579 • -772

  27. A telescope is constructed with two lenses separated by a distance of 29 cm. The focal length of the objective is 24 cm. The focal length of the eyepiece is 5 cm. Calculate the angular magnification of the telescope. • 2 • 10 • 5 • 3 • 20

  28. When you stand in front of a convex mirror, the image you see is _____ . • virtual and inverted • real and inverted if your distance from the mirror is greater than two focal lengths • real and inverted • real and upright • virtual and upright

  29. If you stand closer to a concave mirror than a distance of one focal length, the image you see is _____ . • real and upright • virtual and upright • virtual and inverted • real and inverted • none of the above because you do not get an image

  30. The image of an object beneath the surface of a medium of refractive index {image} is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is _____ . • virtual and closer to the viewer than the object • virtual and farther from the viewer than the object • real and farther from the viewer than the object • real and closer to the viewer than the object • virtual and the same distance from the viewer as the object

  31. If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where {image} and where the lens would have an effective index of refraction {image} the lens would act in the same way _____ . • as a convex lens in air • as a concave lens in air • as the glasses worn by a farsighted person • as a concave mirror in air • as a flat refracting surface between water and air as seen from the water side

  32. A magician can make a candle look as if it is burning under water by focusing light from a candle flame burning in air directly on top of an underwater candle. To do this you want to use a _____ . • convex lens closer than one focal length to the burning candle. • biconcave lens farther than one focal length from the burning candle • concave mirror farther than one focal length from the burning candle • convex mirror farther than one focal length from the burning candle • concave mirror closer than one focal length to the burning candle

  33. The inhabitants of a planet in another galaxy have their eyes at the exact center of their 4.4-m long bodies. How long must a plane mirror be for such a creature to be able to see all of its body in the mirror? • 3.3 • 2.1 • 5.6 • 2.2 • 8.8

  34. 1. 2. 3. 4. 5. Of the possible statements that parallel rays are brought to a focus by a 1) converging lens, 2) diverging lens, 3) concave mirror, 4) convex mirror. Which of the answers are correct? • 2 and 4 • 3 and 4 • 1 and 3 • 1 and 4 • 1 and 2

  35. The object in a ray diagram is perpendicular to the principal axis but does not have one end lying on the principal axis. What is the minimum number of rays that must be drawn in this ray diagram in order to determine the position of the image? • 3 • 1 • 4 • 2 • 5

  36. 1. 2. 3. 5. 4. In the overhead view of the figure below, the image of the stone seen by observer 1 is at {image} {image} At which of the five points {image} or {image} does observer 2 see the image? • {image} • {image} • {image} • {image} • {image}

  37. You are standing about 2 m away from a mirror. The mirror has water spots on its surface. True or false? It is possible for you to see the water spots and your image both in focus at the same time. • True • False

  38. You wish to reflect sunlight from a mirror onto some paper under a pile of wood in order to start a fire. Which would be the best choice for the type of mirror? • Flat. • Concave. • Convex.

  39. Consider the image in the mirror in the figure below. {image} Based on the appearance of this image, you would conclude that _____. • the mirror is concave and the image is real • the mirror is concave and the image is virtual • the mirror is convex and the image is real • the mirror is convex and the image is virtual

  40. 1. 2. 3. 4. In the figure below, what happens to the image point {image} as the object point {image} is moved to the right from very far away to very close to the refracting surface? {image} • It is always to the right of the surface. • It is always to the left of the surface. • It starts off to the left and at some position of {image} moves to the right of the surface. • It starts off to the right and at some position of {image} moves to the left of the surface.

  41. 1. 2. 3. In the figure below, what happens to the image point {image} as the object point {image} moves toward the right-hand surface of the material of index of refraction {image} {image} • It always remains between {image} and the surface, arriving at the surface just as {image} does. • It moves toward the surface more slowly than {image} so that eventually {image} passes {image} • It approaches the surface and then moves to the right of the surface.

  42. What is the focal length of a pane of window glass? • Zero. • Infinity. • The thickness of the glass. • Impossible to determine.

  43. Diving masks often have a lens built into the glass for divers who do not have perfect vision. This allows the individual to dive without the necessity for glasses, because the lenses in the faceplate perform the necessary refraction to provide clear vision. The proper design allows the diver to see clearly with the mask on both under water and in the open air. Normal eyeglasses have lenses that are curved on both the front and rear surfaces. The lenses in a diving mask should be curved _____. • only on the front surface • only on the rear surface • on both the front and rear surfaces

  44. A curved mirrored surface can have _____. • spherical aberration but not chromatic aberration • chromatic aberration but not spherical aberration • both spherical aberration and chromatic aberration

  45. A camera can be modeled as a simple converging lens that focuses an image on the film, acting as the screen. A camera is initially focused on a distant object. To focus the image of an object close to the camera, the lens must be _____. • moved away from the film • left where it is • moved toward the film

  46. Two campers wish to start a fire during the day. One camper is nearsighted and one is farsighted. Whose glasses should be used to focus the Sun's rays onto some paper to start the fire? • Either camper. • The nearsighted camper. • The farsighted camper.

  47. Which glasses in the figure below correct nearsightedness and which correct farsightedness? {image} • The eyeglasses on the left correct for nearsightedness. The eyeglasses on the right correct for farsightedness. • Both the eyeglasses correct for farsightedness. • The eyeglasses on the left correct for farsightedness. The eyeglasses on the right correct for nearsightedness. • Both the eyeglasses correct for nearsightedness.

  48. 1. 2. 3. 4. 5. Does your bathroom mirror show you older or younger than you actually are? Compute an order-of-magnitude estimate for the age difference, based on data that you specify. • {image} older • The mirror shows your actual age. • {image} older • {image} younger • {image} younger

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