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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
image
A. at `O`
B. above `O`
C. below `O`
D. anywhere depending on angle `theta`, thickness of plate `t`

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Best answer
Correct Answer - D
image
`Deltax=[d sin theta-(mu-1)t]`
If `Deltax=0`, at `O`
`Deltax=+ve`, above `O`
`Deltax=-ve`, below `O`

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