First slide

Young's double slit Experiment

Question

The path difference between two interfering waves at a point on a screen is 11. 5 times the wavelength' The point is

NA

A

dark
B

bright
C

neither dark nor bright
D

data are inadequate

Solution

Path difference = $11 \cdot 5 λ = 23 (λ / 2)$
So the path difference is odd [23] multiple of $λ$ /2
Thus there will be destructive interference.
Hence the point would be dark

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