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A. If both Assertion \& Reason are True \& the Reason is a correct explanation of the Assertion.
P
B. If both Assertion \& Reason are True but Reason is not a
W. correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion \& Reason are False.
Assertion : The central fringe is bright or dark, it dependents on the initial phase difference between the two coherent sources.

Reason : The pattern and position of fringes always remains same even after the introduction of transparent medium in a path of one of the slit.
(1) A
(2) B
(3) \( \mathrm{C} \)
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