A parallel sided block of glass of refractive index 2 which is 40 mm thick rests on the floor of a tank which 4 is filled with

Question

A parallel sided block of glass of refractive index 2 which is 40 mm thick rests on the floor of a tank which 4 is filled with water w 3 The difference betweer apparent depth of floor at A and B when seen from vertically above is equal to

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