Prism equation - i+e = A+δ, where, i is angle of incidence, e is angle of emergence, A is angle of the prism and δ is angle of deviation. The case of normal incidence that I am referring is to, is as in the diagram.
Does prism equation (i+e = A+δ) apply to all prims, equilateral and right angled? And does it fail for normal incidence on a prism?
For eg. when light is incident normally on one of the sides of an equilateral prism, it deviates the light through 60°. i+e = 0. A+δ = 60+60 = 120°.
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