Where, “i” (angle of incidence ) and Refractive index “n” = sin i/sin r. Where “r” (angle of refraction) and sin “i”/sin “r” for a particular medium remains same i.e., constant.
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Try to understand – nA = sin i/sin r = sin 45°/sin 45° = 1 nB = sin i/sin r = sin 45°/sin 45° = 1/√2 x 2/1 = √2 = 1.414
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