The path difference between two interfering waves at a point on a screen is 11. 5 times the wavelength' The point is
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a
dark
b
bright
c
neither dark nor bright
d
data are inadequate
answer is A.
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Detailed Solution
Path difference = 11⋅5λ=23(λ/2)So the path difference is odd [23] multiple of λ/2Thus there will be destructive interference.Hence the point would be dark