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Q.

A Young's double-slit arrangement produces interference fringes for sodium light (λ=5890 A0) that are 0.20   apart.  The angular fringe separation if the entire arrangement is immersed in liquid of refractive index 53

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a

0.240

b

0.360

c

0.120

d

0.480

answer is C.

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Detailed Solution

Angular fringe width in air θ=0.20 Refractive index μ=53 Angular fringe width in liquid θ'=?                   θ1=θμ                      =0.253                   ∴θ'=0.120
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