What makes the light waves in laser light parallel ?
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- The waves in laser light are not parallel.
- It is theoretically impossible to construct a beam with perfectly parallel rays unless you have an infinitely wide beam.
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A laser beam is not just focused light. A laser beam is coherent light. Furthermore, you can't create a laser beam by cleverly focusing regular light, no matter how hard you try. You create a laser beam using stimulated emission. Stimulated emission is what causes the light in a laser beam to be coherent, and coherence is what makes a laser beam so much more useful than regular light. In fact, the word "laser" is actually an acronym that stands for "Light Amplification by Stimulated Emission of Radiation"
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