allerySnell's law states:
An₁ θ₁ = n₂ θ₂
Bn₁ sin θ₁ = n₂ sin θ₂
Csin θ₁/sin θ₂ = n₁/n₂
Dθ₁ = θ₂
Answer & Solution
Correct answer: B. n₁ sin θ₁ = n₂ sin θ₂
**Snell's law:** n₁ sin θ₁ = n₂ sin θ₂.
Angles measured from normal.
When light enters denser medium (n₂ > n₁), it bends TOWARD normal.
Foundation of lens design, fiber optics.
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