The angle of the incidence (T) = 40°
Angle of refraction (r) = 26°
→To find the speed of light in the material
From shell's law, we know
n: sin i/sin = speed of light in air/Speed of light in the medium
Sin 40°/sin 60° = 3×10⁸/V
V = 3 × 10⁸× sin 26°/sin 40°
→ V medium = 2 × 10⁸ m/s.
