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Apparent shift of an ink mark seen through a glass slab

This type of question, asked 4 times: 11 May 2023 S1, 16 May 2023 S1, 12 May 2024 S2, 19 Apr 2026 S1. All 4 questions below, oldest first.

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  1. Question 1

    11 May 2023 S1

    15
    An ink mark is made on a piece of paper. A glass slab of thickness 't' is placed on it. The ink mark appears to be raised up through a distance 'x' when viewed at nearly normal incidence. If the refractive index of material of glass slab is 'μ\mu' then thickness of glass slab 't' is given by

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  2. Question 2

    16 May 2023 S1

    49
    A glass slab of thickness 4.8 cm is placed on the piece of paper on which an ink dot is marked. By how much distance would an ink dot appear to be raised? (The refractive index of glass =1.5= 1.5)

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  3. Question 3

    12 May 2024 S2

    34
    An ink mark is made on a piece of paper on which a glass slab of thickness 'tt' is placed. The ink mark appears to be raised up through a distance 'xx' when viewed at nearly normal incidence. If the refractive index of the material of glass slab is 'μ\mu' then the thickness of glass slab is given by

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  4. Question 4

    19 Apr 2026 S1

    140
    A glass slab of thickness 6.06.0 cm is placed on the piece of paper on which an inkdot is marked. By how much distance would an inkdot appear to be raised? The velocity of light in glass is 2×108 ms−12 \times 10^8\ \mathrm{ms^{-1}} and that in air is 3×108 ms−13 \times 10^8\ \mathrm{ms^{-1}}.

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