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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. When two
troughs ....
Middle of essay
....d 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 beams intersect, like two sets of ripples meeting in
a pond, they produce a single new wave pattern: the hologram. H.... |
| Number of words: 1072 |
Approximate pages: 4 |
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