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Interference fringes are produced on a s...

Interference fringes are produced on a screen by using two light sources of intensities / and 9/. The phase difference between the beams `pi/2` is at point P and `pi`at point Q on the screen. The difference between the resultant intensities at point P and Q is

A

2I

B

4I

C

6I

D

8I

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The correct Answer is:
C
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TARGET PUBLICATION-INTERFERENCE AND DIFFRACTION-COMPETITIVE THINKING
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  11. The necessary condition for phenomenon of interference NOT to occur is

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  12. If two sources are not coherent, then we obtain

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