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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

at `O`

B

above `O`

C

below `O`

D

anywhere depending on angle `theta`, thickness of plate `t`

Text Solution

Verified by Experts

The correct Answer is:
D

`Deltax=[d sin theta-(mu-1)t]`
If `Deltax=0`, at `O`
`Deltax=+ve`, above `O`
`Deltax=-ve`, below `O`
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