alleryFor 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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