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Q.

In Young's double-slit experiment, an interference pattern is obtained on a screen by a light of wavelength 6000 Å, coming from the coherent sources S1 and S2. At certain point P on the screen third dark fringe is formed. Then the path difference S1P - S2P in microns is

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a

0.75

b

1.5

c

3.0

d

4.5

answer is B.

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Detailed Solution

For dark fringe at PS1P−S2P=Δ=(2n−1)λ2Here n = 3 and λ=6000So, Δ=5λ2=5×60002=15000Å=1.5 micron

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