In Young’s double-slit experiment, if there is no initial phase difference between the two slits, the point corresponding to the fifth minimum has path difference:
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In Young’s double-slit experiment, if there is no initial phase difference between the two slits, the point corresponding to the fifth minimum has path difference:

G1 Physics · Accepted Answer

Step 1: Condition for nth dark fringe: Δx = (2n − 1)λ/2. Step 2: For fifth minimum n = 5. Step 3: Δx = (10 − 1)λ/2 = 9λ/2. Final answer: (C).