The closest definition of a laser would be which of the following definitions?

Options :
  1. A device that produces coherent light with a narrow range of wavelengths.
  2. A device that produces extremely intense light.
  3. A device that projects electrons at high speed.
  4. A device that polarize photons, propelling them by magnetic repulsion.


Answer and Explanation :-

Answer: Option 1

Explanation:

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