Question
Thu October 20, 2011 By: Venkat Rao

why is interference pateern is not observed for light from two light sorces????

Expert Reply
Thu October 20, 2011
Coherent light sources are sources of light that produce waves that have a constant phase difference between them over a significant duration of time.
In an incandescent bulb, the vibrations of electrons within the filament lead to the production of the electromagnetic wave. Several million times in a second, there are small disruptions of the filament that result in discontinuities in the waves that they produce. Ultimately, two different incandescent bulbs are unable to produce light waves that maintain a constant difference in phase over time. As a result, any interference pattern that does occur will not endure for a sufficient length of time to allow the human eye to observe the pattern.
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