are two identical bulbs os same power and manufrectured by the same company coherent source?
Answers
Answer:
No. To form a single coherent source, you need some mechanism to ensure that all photons emitted by the source are in phase. Basically, some form of laser.
(Your use of the word “bulb” implies some form of incandescent or perhaps fluorescent source. Neither of these can ever be made coherent, as they are effectively a whole lot of tiny sources all acting independently.)
To get two coherent sources, you need to start with one coherent source and split the output somehow.
Of course the interference of light waves obeys the conservation of energy. For every dark spot caused by the waves interfering destructively, there’s a matching much-brighter-than-expected spot caused by them interfering constructively.
To get interference from two sources, you’d need to make them coherent with each other. (The reason the classic double slit experiment works with non-coherent light is down to the single slit the light goes through first; this causes diffraction, making the light ‘spread out’ so each slit receives somewhat-coherent illumination.)
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Answer:
YES
∵ there rating are obtained same test condition.
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