Q.

In YDSE apparatus shown, Δx is path difference between S1P and S2P. Now a thin glass plate is kept in front of S1. Then match List-I and List -II

 List-I List -II
a)Δx at PP)Remains same
b)Fringe widthQ)Decreases
c)Fringe patternR)Shift upwards
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a

aP,bQ,cR

b

aQ,bp,cR

c

aQ,bR,cP

d

aR,bP,cQ

answer is A.

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Detailed Solution

a) Due to glass plate in the path of light from S1, Δx decreases

b) β=λDd, remains same

c) Fringe patterns shift upwards

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