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Combining two thin prisms for dispersion without deviation or deviation without dispersion

This type of question, asked 4 times: 27 Jul 2022, 30 Jan 2023, 28 Jan 2025, 23 Jan 2026 S1. All 4 questions below, oldest first.

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  1. Question 1

    27 Jul 2022

    113
    A thin prism of angle 6∘6^{\circ} and refractive index for yellow light (nY)1.5\left( n_{Y} \right)1.5 is combined with another prism of angle 5∘5^{\circ} and nY=1.55n_{Y}= 1.55. The combination produces no dispersion. The net average deviation ( δ)\delta) produced by the combination is (1x)∘\left( \frac{1}{x} \right)^{\circ}. The value of xx is ____\_\_\_\_.

  2. Question 2

    30 Jan 2023

    108
    A thin prism, P1P_{1} with an angle 6∘6^{\circ} and made of glass of refractive index 1.54 is combined with another prism P2P_{2} made from glass of refractive index 1.72 to produce dispersion without average deviation. The angle of prism P2P_{2} is

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  3. Question 3

    28 Jan 2025

    20
    A thin prism P1P_{1} with angle 4∘4^{\circ} made of glass having refractive index 1.54 , is combined with another thin prism P2P_{2} made of glass having refractive index 1.72 to get dispersion without deviation. The angle of the prism P2P_{2} in degrees is

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  4. Question 4

    23 Jan 2026 S1

    1
    A thin prism with angle 5∘5^{\circ} of refractive index 1.72 is combined with another prism of refractive index 1.9 to produce dispersion without deviation. The angle of second prism is ____\_\_\_\_ .

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