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Height of water to fill so a container appears half filled when viewed from the top

The same question, asked 2 times: 4 May 2023 S2*, 13 May 2026 S2. Every wording below, oldest first.

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  1. Question 1

    4 May 2023 S2

    31
    Some water is filled in a container of height 30 cm. If it is to appear half filled to the observer when viewed from the top of the container, the height up to which water should be filled in it, is [Refractive index of water =4/3= 4/3]

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  2. Question 2

    13 May 2026 S2

    140
    How much water should be filled in a container of height 2121 cm, so that it appears half filled to the observer when viewed from the top of the container? (μ=4/3)(\mu = 4/3)

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