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Question

# Assertion :In Young's experiment, for two coherent sources, the resultant intensity is given by I=4I0cos2ϕ2 Reason: Ratio of maximum to minimum intensity is ImaxImin=(√I1+√I2)2(√I1−√I2)2

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

## The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionThe expression in the assertion is the intensity at a point on the screen where coherent sources have an intensity of I0 each and are out of phase by ϕ.The expression in the reason is the ratio of maximum intensity to the minimum intensity in the interference pattern on a screen obtained when two sources of intensity I1 and I2 are used.Both are true, but reason given is not the actual reason for the assertion here.

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