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Ratio of dispersive powers of two prisms from the deviations of red and blue or violet rays

The same question, asked 2 times: 15 May 2023 S2*, 12 May 2024 S2. Every wording below, oldest first.

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  1. Question 1

    15 May 2023 S2

    34
    A glass prism 'A' deviates the red and blue rays through 10∘10^\circ and 12∘12^\circ respectively. A second prism 'B' deviates them through 8∘8^\circ and 10∘10^\circ respectively. The ratio of their dispersive powers is (A to B)

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  2. Question 2

    12 May 2024 S2

    48
    A glass prism deviates the red and violet rays through 9°9° and 11°11° respectively. A second prism of equal angle deviates them through 11°11° and 13°13° respectively. The ratio of dispersive power of second prism to first prism is

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