For thin prism of refracting angle A (small), deviation δ is approximately:
Aδ = (n+1)A
Bδ = A/n
Cδ = nA
Dδ = (n - 1)A
Answer & Solution
Correct answer: D. δ = (n - 1)A
For thin prism (A small): δ = (n - 1)A. Independent of i (approximately). Used in spectroscopes and direct vision prisms. For larger prisms: μ = sin((A+δ_min)/2)/sin(A/2).
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