A light ray in airstrikes the interface between air and an unknown material at an angle of incidence of 15° and has an angle of refraction of 7°. What is that material’s index of refraction?

Answer 1

Use Snell's law n₁ sin θ₁ = n₂ sin θ₂ where n₁ is 1.00 for air. n₂ = sin 15° / sin 7° = 2.12.