When light passes through a prism, the angle that the refracted ray makes relative to the incident ray is called the deviation angle δ, Fig. 32-64. Show that this angle is a minimum when the ray passes through the prism symmetrically, perpendicular to the bisector of the apex angle ϕ, and show that the minimum deviation angle, δm, is related to the prism’s index of refraction n by
[Hint: For θ in radians, (d/dθ)(sin−1θ) =
FIGURE 32-64
Problems 79 and 80.
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