A monochromatic beam of light fall on YD...

A monochromatic beam of light fall on YDSE apparatus at some angle (say `theta`) as shown in figure. A thin sheet of glass is inserted in front of the lower slit `s_(2)`. The central bright fringe (path difference `= 0`) will be obtained

at O

above O

below O

anywhere depending on angle `theta`, thickness of plate t and refractive index of glass `mu`

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