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Unformatted text preview: The absolute value of is 100, for the image to be magnified 100 times. Is 7 7 3 9 7 39 100 or 100? Since and must be positive, must be negative, so the value of must be 100. 7 7 Since 5.0 m 100 0.050 m or 5.0 7 39 9 37 cm. This is positive, as we expect, since the slide is a real object. Then we can calculate the focal length from: 1 1 1 1 10 0 m 1 0.050 m 0 3 9 0.100/m 20.0/m 20.1/m so 1 m/20.1 0.050 m or 5.0 cm (but just a little less). 0 Note that the slide must be placed just beyond the focal length: is just a 9 little greater than . Since is negative, the image is inverted, so for the image to 7 be rightside up, the slide must be upsidedown in the projector....
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This note was uploaded on 02/11/2012 for the course PHYSICS 112 taught by Professor Fretwell during the Summer '08 term at Iowa State.
 Summer '08
 Fretwell

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