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The Laser


Before we can learn about the laser we need to know a little bit about
light (since that is what a laser is made of). Light from our sun, or from an
electric bulb, is called white light. It is really a mixture of all the
different colours of light. The colours range from violet, indigo, and blue, to
green, yellow, orange, and red. These make up the visible part of the
electromagnetic spectrum. Light is made up of particles, called PHOTONS, which
travel in waves. The difference in the colour depends on the wavelength of the
light. Violet light has the shortest wavelength while red has the longest. There
are other parts of the electromagnetic spectrum which includes infra-red, radar,
television radio and micro- waves (past red on the spectrum), and on the other
end of the spectrum are the other invisible radiations, ultra- violet, X rays,
micro waves and gamma rays. The wavelength of the light is important to the
subject of the laser. A laser is made up of COHERENT...

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Title: The Laser
Approximate word count: 948
Approximate pages: 4 (250 words per double-spaced page)

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