When a monochromatic ray of light is passed through an equilateral glass prism, it is found that the refracted ray in glass is parallel to the base of the prism. If '$i$' and '$e$' denote the angles of incidence and emergence respectively, then}
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The refracted ray is parallel to the base of an equilateral prism only in the condition of minimum deviation, where the angles of incidence and emergence are equal ($i = e$).