A beam of monochromatic light is incident at on one face of an equilateral prism

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

A beam of monochromatic light is incident at i=50∘i = 50^\circ on one face of an equilateral prism, the angle of emergence is 40∘40^\circ , then the angle of minimum deviation is: (a) 30° (b) <30∘< 30^\circ (c) ≤30∘\leq 30^\circ (d) ≥30∘\geq 30^\circ

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