(a) If the refracting angle of a prism is `60^@` and the minimum deviation is `30^@`, then find the angle of incidence.
(b) A ray of light passes through an equilateral prism such that the angle of emergence is equal to the angle of incidence and each is equal to `3//4^(th)` of the angle of prism. Find the angle of deviation.
(c) The refracting of a prism is A and the refractive index of the material of the prism is `cotA//2`. Find the angle of deviation.
(d) The angle of a prism is `60^@`. What is the angle of incidence for minimum deviation? The refractive index of the material of the prism is `sqrt2`.