Optical Instruments HW3

# Optical Instruments HW3 - MasteringPhysics Assignment Print...

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[ Print View ] Physics 228 Spring 2008 Geometric Optics and Optical Instruments (Ch. 34) Due at 11:59pm on Monday, February 11, 2008 View Grading Details Spherical Mirror 1 You wish to create an image that is 10 meters from an object. This image is to be inverted and half the height of the object. You wish to accomplish this using one spherical mirror. Part A What is the focal length of the mirror that would accomplish this? Express your answer in meters, as a fraction or to three significant figures. Part A.1 Find the focal length Part not displayed Part A.2 Find the magnification Part not displayed Part A.3 Use the magnification to find and Part not displayed ANSWER: = 6.67 Part B Is this a concave or convex mirror? Remember that concave mirrors have positive focal lengths, and convex mirrors have negative focal lengths. You calculated a positive focal length in Part A, so the mirror must be concave. ANSWER: concave convex Part C What is the magnitude of the radius of curvature of this mirror? Hint C.1 Relating focal length and radius of curvature Hint not displayed Page 1 of 13 MasteringPhysics: Assignment Print View 5/7/2008 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1116514

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Express your answer in meters, as a fraction or to three significant figures. ANSWER: = 13.3 Part D What type of image is created, real or virtual? Real images have positive image distance, and virtual images have negative image distance. Since you calculated a positive image distance in Part A, the image must be real. Hint D.1 Real versus virtual Hint not displayed ANSWER: real virtual Image Size in a Mirror A guy named Joe, who is 1.6 meters tall, enters a room in which someone has placed a large convex mirror with radius of curvature equal to 30 meters. The mirror has been cut in half, so that the axis of the mirror is at ground level. As Joe enters the room, he is 5 meters in front of the mirror, but he is looking the other way, so he fails to see it. When he turns around, he is startled by his own image in the mirror. Part A How far away does the image appear to Joe? Express your answer in meters, to three significant figures or as a fraction. Part A.1 Find the focal length Part not displayed Hint A.2 Finding the distance from Joe to his image Hint not displayed Page 2 of 13 MasteringPhysics: Assignment Print View 5/7/2008 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1116514
Joe is so startled by his image that he falls forward. (Assume that his feet stay at the same position.) ANSWER: 8.75 Part B What is the image height that Joe sees in the mirror? Express your answer in meters, to three significant figures or as a fraction. Hint B.1

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Optical Instruments HW3 - MasteringPhysics Assignment Print...

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