What happens to the interference pattern if the two slits $S_{1}$ and $S_{2}$ in Young's double-slit experiment are illuminated by two independent identical sources? What is the reason for your answer?

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The two sources do not emit light of the same wavelength.

The two sources emit waves that travel with different speeds.

The two sources emit light waves of different amplitude.

There is no constant phase difference between the waves emitted by the two sources.

answer is D.

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Detailed Solution

No fringes would be observed because the two sources are non-coherent as there is no constant phase difference between the waves emitted by the two sources. Superposition of incoherent waves gives uniform illumination at every point.

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