A young double slit apparatus is immersed in a liquid of refractive index μ 1 . The slit plane touches the liquid surface. A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on the slits.
(i) Find the fringe width-
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Ans.
(i)
Sol. fringe width = 
= 
= 
(ii)
Sol.
Δ x at P = t in air + S 2 
– ( 
+ S 1 
)
⇒ t + 
– t μ 2 = 0
(1 – μ 2 ) t = 
μ 1
x = D 
(iii)
Sol.
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