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Assertion: Two coherent sources S1 and S...

Assertion: Two coherent sources `S_1 and S_2` are placed in front of a screen as shown in figure. At point P, 10th order maxima is obtained. Then , 11th order maxima will be obtained above P.

Reason: For 11th order maxima path difference should be more.

A

(a)If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

B

(b)If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.

C

(c) If Assertion is true, but the Reason is false.

D

(d) If Assertion is false, but the Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
D
At centre, path difference is maximum and this is
equal to `S_1``S_2`. Then, path difference decreases as
we move away on the screen. So, order of fringe
also decreases. Hence, 11th order maxima occurs
before 10th order maxima.
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