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Question

In Young's double slit experiment, the path difference between two interfering waves at a point on screen is 13.5 times the wavelength. The point is:

A
bright but not central bright
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B
neither bright nor dark
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C
central bright
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D
dark
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Solution

The correct option is D dark
Given,
path difference ()=13.5λ.....(i)
We know that,
path difference ()=(n+12)λ.....(ii)
We can write Eq. (i) in the following form
=(13+12)λ.....(iii)
From Eqs. (ii) and (iii), it is clear that there will be minima. So, the point will be dark.

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