allerySnell's law of refraction is:
Asinθ₁ · sinθ₂ = constant
Bn₁ sinθ₁ = n₂ sinθ₂
Cn₁ cosθ₁ = n₂ cosθ₂
Dn₁ θ₁ = n₂ θ₂
Answer & Solution
Correct answer: B. n₁ sinθ₁ = n₂ sinθ₂
1. Snell: n₁ sinθ₁ = n₂ sinθ₂, with angles measured from the normal.
2. Equivalent: sinθ₁ / sinθ₂ = n₂ / n₁ = n₁₂ (relative refractive index).
3. Reduces to the simple geometric statement when angles are small.
_Source: syllabus Science Ch 9 §9.3.2 Laws of Refraction_
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