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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

A

`(mu-1)t=d sin theta`

B

`(mu-1)t=d cos theta`

C

`(mut)=d theta`

D

Not possible

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The correct Answer is:
A
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