Consider an isosceles trapezoid of material of refractive index $2$ and dimensions of sides being 5 cm , $5 cm, 10 cm$ and 5 cm . The angle of minimum deviation by this arrangement when light is incident from air and emerges in air is

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For minimum deviation, ∠ r 1 ​ = ∠ r 2 ​ = 3 0 ∘ ∴ ∠ i = ∠ e = 4 5 ∘ ∴ δ min ​ = i + e − A = 3 0 ∘

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