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Position of an air bubble inside a glass cube from its apparent distances seen from both faces

The same question, asked 2 times: 9 May 2024 S2*, 25 Apr 2025 S2. Every wording below, oldest first.

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  1. Question 1

    9 May 2024 S2

    46
    A transparent glass cube of length 24 cm has a small air bubble trapped inside. When seen normally through one surface from air outside, its apparent distance is 10 cm from the surface. When seen normally from opposite surface, its apparent distance is 6 cm. The distance of the air bubble from first surface is

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  2. Question 2

    25 Apr 2025 S2

    38
    A glass cube of length 21 cm has a small air bubble trapped inside. When viewed normally from the opposite face, its apparent distance is 6 cm. The refractive index of glass and the actual distance of the air bubble from the first surface respectively are

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