Holograms

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behind it, you can just move your
head to one side. The apple seems to "move" out of the way so you can
see the orange or even the back of the apple. If that seems a bit
obvious, just try looking behind something in a regular photograph!
You can't, because the photograph can't reproduce the infinitely complicated
waves of light reflected by objects; the lens of a camera can only focus those
waves into a flat, 2-D image. But a hologram can capture a 3-D image so
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 ...

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