Abstract
According to many textbooks on optics, the deviation angle of a prism with the apex angle (or prism angle), γ, and the refractive index, n, with respect to the surrounding medium can be approximated by δappr=(n-1)γ, if γ≪π/2 and the angle of incidence α1≪π/2. The validity of this approximation is investigated considering the relative error of the deviation. It is shown that this approximation can be extended to angles of incidence α1=nγ with very fair accuracy and even to larger prism angles γ<π/4 in the range of angles of incidence near the minimum of deviation depending on the acceptable relative error.
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