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A pocket laser, refrigerator magnet and LEGO set mimic magnetic force microscopy. The refrigerator magnet is moved back and forth by a motor underneath a cantilever whose underside has a magnet. As the refrigerator magnet moves, it is alternately attracted to and repelled by the magnet on the cantilever. To amplify this vertical movement, the beam from a pocket laser is bounced off of a mirror that sits on top of the cantilever. The reflected light from the laser beam is observed on a wall. (JCE; Companion Chapter 2)
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