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What is meant by the statement that a laser beam is coherent, mono-chromatic and parallel?

User Fbrandel
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Answer:

Laser light however contains only one wavelength. This property makes lasers monochromatic, meaning of one color. Another property of lasers is that all the wavelengths are in phase, meaning they wave together. This property is called coherency. Laser light travels in the same direction, parallel to one another.

User David Colwell
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