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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 and refractive index of glass `mu`

Text Solution

Verified by Experts

The correct Answer is:
D
`dsintheta= (mu-1)t` , central fringe is obtained at O
`dsintheta gt (mu-1)t` central fringe is obtained above O and
`dsintheta lt (mu-1)t`central fringe is obtained below O
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