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Which among the following is an example of coherent sources?

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in Physics – Class 12 by (135k points)
Which among the following is an example of coherent sources?

(a) Fluorescent tubes

(b) LED light

(c) LASER

(d) Tungsten filament lamps

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This key question is from Coherent and Incoherent Addition of Waves in portion Wave Optics of Physics – Class 12

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Correct answer is (c) LASER

To explain: LASER is the short form for Laser Amplification by Stimulated Emission Radiation. The amplified light beam coming out of a LASER is essentially due to the emission of electrons stimulated by incident radiation consisting of photons. As a result, this causes the coherent behavior of the LASER beam.

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