Question

Is it possible to observe interference fringes with light emitting from two sources ?why?

Answer 1

Answer:

The first person to observe the interference of light was Thomas Young in 1801. He used sunlight passing through two closely spaced slits. ... Note that you can't use two light sources (two lasers, two light bulbs, two candles, etc.) because they each experience random changes in phase about once every 10-8 s.

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