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Q.

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