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Q.

What happens to the interference pattern if the two slits S1 and S2 in Young's double-slit experiment are illuminated by two independent identical sources? What is the reason for your answer?

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a

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

b

The two sources emit waves that travel with different speeds.

c

The two sources emit light waves of different amplitude.

d

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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