2. In the Young's double slit experiment, when a glassplate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength 2), the intensity at the position where the central maxima occurred previously remains unchanged. The minimum thickness of the glassplate is 22 (b) 3 (a) 22 (c) (d) 2 <一3
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