A ray of light incident on one face of an equilateral glass prism is refracted in such a way that it emerges from the opposite surface at an angle of 90° to the normal. Calculate the i. angle of incidence. ii. minimum deviation of the ray of light passing through the prism. [ nglass= 1.52]

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Dispersion of White Light

Snell’s law is a formula that gives a relation between the angle of incidence and angle of refraction and is given as: