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
answer is D.
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Detailed Solution
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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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