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Holograms
Beginning of essay
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. W ....
Middle of essay
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lifelike that you can look around the image of the apple to an orange in the
background -and it's all thanks to the special kind of light waves produced
by a laser.
"Normal" white light from the sun or a lightbulb is a combination
of every colour of light in the spectrum -a mush of different waves that's
useless for holograms. But a laser shines light in a thin, intense beam that's
just one colour. That means laser light waves are uniform and in step. When
two laser.... |
| Number of words: 1070 |
Approximate pages: 4 |
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