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Unformatted text preview: Chapter 23 M irrors and Lenses Quick Quizzes 1. At C . 2. (c). Since water air n n , the virtual image of the fish formed by refraction at the flat water surface is closer to the surface than is the fish. See Equation 23.9. 3. (a) False. A concave mirror forms an inverted image when the object distance is greater than the focal length. (b) False. The magnitude of the magnification produced by a concave mirror is greater than 1 if the object distance is less than the radius of curvature. ( c) True. 4. (b). In this case, the index of refraction of the lens material is less than that of the surrounding medium. Under these conditions, a biconvex lens will be divergent. 5. Although a ray diagram only uses 2 or 3 rays (those whose direction is easily determined using only a straight edge), an infinite number of rays leaving the object will always pass through the lens. 6. (a) False. A virtual image is formed on the left side of the lens if p f < . (b) True. An upright, virtual image is formed when p f < , while an inverted, real image is formed when p f . (c) False. A magnified, real image is formed if 2 f p f , and a magnified, virtual image is formed if p f < . 11 12 CHAPTER 23 Answers to Even Numbered Conceptual Questions 2. If the finger and the image are at the same distance from you, then they will coincide regardless of what angle you view them from. However, if one is closer than the other, they will appear to coincide only when viewed along the line connecting their positions. When viewed at any angle to this line, the finger and image are seen separately. 4. Chromatic aberration is produced when light passes through a material, as it does when passing through the glass of a lens. A mirror, silvered on its front surface never has light passing through it, so this aberration cannot occur. This is only one of many reasons why large telescopes use mirrors rather than lenses for their primary optical elements. 6. Make the mirror an efficient reflector (shiny); use a parabolic shaped mirror so that it reflects all rays to the image point, even those far from the axis; most important, use a large-diameter mirror in order to collect more solar power. 8. A flat mirror does not reverse left and right. The image of the left hand forms on the left side and the image of the right hand forms on the right side. 10. All objects beneath the stream appear to be closer to the surface than they really are because of refraction. Thus, the pebbles on the bottom of the stream appear to be close to the surface of a shallow stream. 12. An effect similar to a mirage is produced except the “mirage” is seen hovering in the air. Ghost lighthouses in the sky have been seen over bodies of water by this effect....
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This test prep was uploaded on 04/08/2008 for the course PHY 102 taught by Professor Luo during the Spring '08 term at SUNY Buffalo.
- Spring '08