A glass cube of length 24 cm has a small air bubble trapped inside. When viewed normally from one face it is 10 cm below the surface. When viewed normally from the opposite face, its apparent distance is 6 cm. The refractive index of glass is (a) 1.50 (b) 1.40 (c) 1.45 (d) 1.55

Answer: (a). Real depths from the two faces add to the cube length: μ(10 + 6) = 24. μ = 24/16 = 1.50. So the answer is (a) 1.50.

A glass cube of length 24 cm has a small air bubble trapped inside… | MHT CET 2021 (21 Sep, Shift 1)

Q58MHT CET 2021 · 21 SEP · SHIFT 1Medium

Refraction, Glass Slab & Apparent Depth

A glass cube of length $24\text{ cm}$ has a small air bubble trapped inside. When viewed normally from one face it is $10\text{ cm}$ below the surface. When viewed normally from the opposite face, its apparent distance is $6\text{ cm}$ . The refractive index of glass is

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Answer: (a)

Real depths from the two faces add to the cube length: $\mu(10 + 6) = 24$ .
$\mu = \dfrac{24}{16} = 1.50$ .
So the answer is (a) 1.50.

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