Chap 32 SM - Chapter 32 Optical Images Conceptual Problems...

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967 Chapter 32 Optical Images Conceptual Problems 1 Can a virtual image be photographed? If so, give an example. If not, explain why. Determine the Concept Yes. Note that a virtual image is seen because the eye focuses the diverging rays to form a real image on the retina. For example, you can photograph the virtual image of yourself in a flat mirror and get a perfectly good picture. 2 Suppose the x, y, and z axes of a 3-D coordinate system are painted a different color. One photograph is taken of the coordinate system and another is taken of its image in a plane mirror. Is it possible to tell that one of the photographs is of a mirror image? Or could both photographs be of the real coordinate system from different angles? Determine the Concept Yes; the coordinate system and its mirror image will have opposite handedness. That is, if the coordinate system is a right-handed coordinate system, then the mirror image will be a left-handed coordinate system, and vice versa. 3 [SSM] True or False ( a ) The virtual image formed by a concave mirror is always smaller than the object. ( b ) A concave mirror always forms a virtual image. ( c ) A convex mirror never forms a real image of a real object. ( d ) A concave mirror never forms an enlarged real image of an object. ( a ) False. The size of the virtual image formed by a concave mirror when the object is between the focal point and the vertex of the mirror depends on the distance of the object from the vertex and is always larger than the object. ( b ) False. When the object is outside the focal point, the image is real. ( c ) True. ( d ) False. When the object is between the center of curvature and the focal point, the image is enlarged and real.
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Chapter 32 968 4 An ant is crawling along the axis of a convex mirror that has a radius of curvature R. At what object distances, if any, will the mirror produce ( a ) an upright image, ( b ) a virtual image, ( c ) an image smaller than the object, and ( d ) an image larger than the object? Determine the Concept Let s be the object distance and f the focal length of the mirror. ( a ) If R s 2 1 < , the image is virtual, upright, and larger than the object. ( b ) If R s 2 1 < , the image is virtual, upright, and larger than the object. ( c ) If R s > , the image is real, inverted, and smaller than the object. ( d ) If R s R < < 2 1 , the image is real, inverted, and larger than the object. 5 [SSM] An ant is crawling along the axis of a concave mirror that has a radius of curvature R. At what object distances, if any, will the mirror produce ( a ) an upright image, ( b ) a virtual image, ( c ) an image smaller than the object, and ( d ) an image larger than the object? Determine the Concept ( a ) The mirror will produce an upright image for all object distances. ( b ) The mirror will produce a virtual image for all object distances.
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This note was uploaded on 02/28/2012 for the course PHYSICS 122 taught by Professor Goussiou during the Spring '12 term at University of Washington.

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Chap 32 SM - Chapter 32 Optical Images Conceptual Problems...

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