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Q.

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

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a

at O

b

above O

c

below O

d

anywhere deepening on angle θ, thickness of plate t and refractive index of glass μ

answer is D.

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Detailed Solution

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