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Questions  

A monochromatic beam of light falls on YDSE apparatus at some angle (say q) as shown in figure. A thin sheet of glass is inserted in front of the lower slit S2. The central bright fringe (path difference = 0) will be obtained 

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a
At O
b
Above O
c
Below O
d
Anywhere depending on angle q, thickness of plate t and refractive index of glass m

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detailed solution

Correct option is D

If  dsinθ=(μ−1)t, central fringe is obtained at O  If  dsinθ>(μ−1)t, central fringe is obtained above O and If  dsinθ<(μ−1)t, central fringe is obtained below O.


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