Unformatted text preview: The absolute value of is 100, for the image to be magnified 100 times. Is 7 7 3 9 7 œ 3Î9 100 or 100? Since and must be positive, must be negative, so the value of must be 100. 7 7 œ Since 5.0 m 100 0.050 m or 5.0 7 œ 3Î9ß 9 œ 3Î7 œ Ð ÑÎÐ Ñ œ 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 Î0 œ Î3 Î9 œ ÎÐ Þ Ñ ÎÐ Ñ 0.100/m 20.0/m 20.1/m œ œ so 1 m/20.1 0.050 m or 5.0 cm (but just a little less). 0 œ œ 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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 Summer '08
 Fretwell
 1 m, 0.050 M, 5.0 cm

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