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Deviation in an equilateral prism from the angles of incidence and emergence

This type of question, asked 3 times: 4 May 2023 S1, 13 May 2024 S2, 14 May 2026 S2. All 3 questions below, oldest first.

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  1. Question 1

    4 May 2023 S1

    11
    In an equilateral prism the ray undergoes minimum deviation when it is incident at an angle of 50∘50^\circ. The angle of minimum deviation is

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  2. Question 2

    13 May 2024 S2

    3
    A ray of light passes through an equilateral prism such that the angle of incidence (ii) is equal to angle of emergence (ee). The angle of emergence is equal to 34\frac{3}{4}th the angle of prism. The angle of deviation is

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  3. Question 3

    14 May 2026 S2

    140
    An equilateral prism deviates a ray through 45∘45^\circ for the two angles of incidence differing by 20∘20^\circ. One of the angle of incidence is

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