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Q.

A young’s double slit arrangement produce interference fringes for sodium light  λ = 5890 Aothat are 0.150 apart. What is the angular fringe separation, if the entire arrangement is immersed in liquid of refractive index 5/3.

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a

0.090

b

0.120

c

0.150

d

0.200

answer is A.

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Detailed Solution

θ=βD Fringe width, β=Dλd ⇒θ=λd  When whole system is immersed in liquid then λ  becomes  λn ⇒θ=3λ/5d=35λd=350.15=0.090
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