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What happens to the interference pattern...

What happens to the interference pattern if the two slits in Young's experiment are illuminated by two independent sources such as two sodium lamps S and S' as shown in figure

A

The intensity of the bright fringes is doubled

B

The intensity of the bright fringes becomes four times

C

Two sets of interference fringes overlap

D

No interference pattern is observed

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The correct Answer is:
D
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