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A beam of monochromatic light is incident at i = 50° on one face of an equ

A beam of monochromatic light is incident at i = 50° on one face of an equilateral prism, the angle of emergence is 40°, then the angle of minimum deviation is : (1) 30° (2) < 30° (3) ≤ 30° (4) ≥ 30°

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