For the prism shown, the deviation δ depends on the angle of incidence i, refractive index n, and prism angle A. At MINIMUM deviation, the relation between i and the angle of emergence e is: 
Ae = A - i
Bi = 2e
Ce = 0
Di = e (symmetric ray path through prism)
Answer & Solution
Correct answer: D. i = e (symmetric ray path through prism)
At minimum deviation, ray passes symmetrically through prism: angle of incidence equals angle of emergence (i = e). Refraction angles inside also equal (r₁ = r₂ = A/2). From this geometry: μ = sin((A+δ_min)/2)/sin(A/2).
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