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Holograms
Toss a pebble in a pond -see the ripples? Now drop two pebbles close
together. Look at what happens when the two sets of waves combine -you get a
new wave! When a crest and a trough meet, they cancel out and the water goes
flat. When two crests meet, they produce one, bigger crest. When two troughs
collide, they make a single, deeper trough. Believe it or not, you've just
found a key to understanding how a hologram works. But what do waves in a
pond have to do with those amazing three-dimensional pictures? How do
waves make a hologram look like the real thing?
It all starts with light. Wi ....
Word count: 1070 - Page count: 4
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