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Which among the following is an example of coherent sources?(a) Fluorescent tubes(b) LED light(c) LASER(d) Tungsten filament lampsI got this question in an interview for job.This key question is from Coherent and Incoherent Addition of Waves in portion Wave Optics of Physics – Class 12

Answer»

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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