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The output from a LASER is monochromatic. It means that it is (A) Directional (B) Polarised (C) Narrow beam (D) Single frequency

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The output from a LASER is monochromatic. It means that it is
(A) Directional
(B) Polarised
(C) Narrow beam
(D) Single frequency

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The answer is (D) Single frequency

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