Space between slit & screen and sources and slits is filled with a liquid of refractive index µ 3 . A plate of thickness t & refractive index µ 2 is placed in front of one of the slit. A source S is placed above OP at a distance d in front of slit (Given D = 1m, d = 2mm, t = 6 × 10 –6 m, µ 2 = 1.2, µ 3 = 1.8)
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(b, d)
if slab is removed then 
Shifting of CM is by 1 mm
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