Question

The refractive index of glass relative to air is 1.5. What is the critical angle for the glass-air interface?

Answer 1

Given: Refractive index of glass relative to air (μ) = 1.5

To Find: Critical angle (C)

Formula: sin⁡ C = `1/μ`

sin C = `1/1.5`

sin C = 0.6667

C = sin⁻¹ (0.6667)

C ≈ 41.8°