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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

(a) at O

B

(b) Above O

C

(c) Below O

D

(d) Anywhere depending on angle `theta`, thickness of plate t and refractive index of glass `mu`

Text Solution

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