Question

The angle of refraction in a glass block of refractive index 1.5 is 19°. Calculate the angle of incidence.

Answer 1

\[ \mu = \frac{\sin i}{\sin r} \]

sin i = μ × sin r

= 1.5 × sin 19°

= 1.5 × 0.3256

sin i ≈ 0.4884

i = sin⁻¹ (0.4884)

≈ 29.2°

The angle of incidence is approximately 29.2°.