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A monochromatic beam of light falls on Y...

A monochromatic beam of light falls on YDSE apparatus at some angle `(say theta)` as shown in the 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

Central maxima will be at O always

B

If `(mu-1) t=d sin theta`, central maxima will be at O

C

if `(mu-1)t gt d sin theta`, central maxima will be below O

D

If `(mu-1)t=d sin theta+ lambda`, a maxima is formed at O

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The correct Answer is:
B, C, D
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