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16.VBIn a Young's double slit experiment, 'a slab ofthickness 1.2 um and refractive index 1.5 is placedin front of one slit and another slab of thickness tand refractive index 2.5 is placed in front of thesecond slit. If the position of the central fringeremains unaltered, then the thickness t is-SIwipes(1) 0.4 um(2) 0.8 um (3) 1.2 um (4) 7 um |
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