Refractive index = real depth / apparent depth.
Apparent depth = {8 / (4/3)} + {3.5 / (7/4)} = 6 + 2 = 8 cm
Refractive index = real depth / apparent depth.
Apparent depth = {8 / (4/3)} + {3.5 / (7/4)} = 6 + 2 = 8 cm
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