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A simple magnifier for viewing postage stamps and other pieces of paper consists of a thin lens mounted on a stand. When this device is placed on a stamp, the stand holds the lens at the proper distance from the stamp for viewing. (See Figure 25.19.) If the lens has a focal length of 11.5 cm, and the image is to be at infinity, (a) what is the angular magnification of the device, and (b) how high should the stand hold the lens above the stamp?
Figure 25.19
Problem 24.
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