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TB_chapter23

# TB_chapter23 - Chapter 23 Mirrors and Lenses CHAPTER 23...

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Chapter 23, Mirrors and Lenses C HAPTER 23 Conceptual Questions C1. An eyeglass lens is cut with one surface having a radius R 1 and the other surface having a radius R 2 , with R 1 < R 2 . Both positive radii are measured from the same side with R 1 being the side closer to the eye. Is this convex-concave lens a converging lens or a diverging lens? a. This is a converging lens. b. This is a diverging lens. c. This can be either a converging or diverging lens, as more information is needed for a final determination. d. This is neither, since a lens cannot be made this way. C2. A concave mirror has radius R. When an object is located a distance 2R from the lens, which describes the image formed? C3. A convex lens has a focal length of magnitude F. At which of the following distances from this lens would a real object give an inverted virtual image? a. ½ F b. 2F c. Any value greater than 2F. d. This cannot be done with a convex lens. C4. A real object is place a distance d from a converging lens. The object is then moved to a distance 2d from the converging lens. Which of the following statements is false? C5. A real object is place to the left of a converging lens and an image forms. Then, to the right of the converging lens a diverging lens is placed. A real, inverted final image forms to the right of the diverging lens. Which of the following could give this result? diverging lens is to be placed. 23.1 Flat Mirrors 139

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Chapter 23, Mirrors and Lenses 1. You stand two feet away from a plane mirror. How far is it from you to your image? a. 2.0 ft b. 3.0 ft c. 4.0 ft d. 5.0 ft
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