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Question :-

Lasers and incandescent lights are different in an important way. Incandescent light from light bulbs emits light of different wavelengths and moves in many directions. On the other hand, laser beams are monochromatic, consisting of a single wavelength. They can travel great distances without spreading. Any comparison of laser and incandescent lights must include a discussion of
small and large light bulbs.
wavelengths.
soundwaves.
echoes.

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