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Question: Answered & Verified by Expert
A glass cube of length $24 \mathrm{~cm}$ has a small air bubble trapped inside. When viewed normally from one face it is $10 \mathrm{~cm}$ below the surface. When viewed normally from the opposite face, its apparent distance is $6 \mathrm{~cm}$. The refractive index of glass is
PhysicsRay OpticsMHT CETMHT CET 2021 (21 Sep Shift 1)
Options:
  • A 1.50
  • B 1.40
  • C 1.45
  • D 1.55
Solution:
2737 Upvotes Verified Answer
The correct answer is: 1.50
Let $\mathrm{x}$ be the real depth from first surface
$$
10=\frac{\mathrm{x}}{\mu}
$$
When viewed from opposite face
$$
6=\frac{24-x}{\mu}
$$
By solving, $\mu=1.5$

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