The absolute refractive index of Ruby is 1.7

• Reflection & Refraction (C10)

The absolute refractive index of Ruby is 1.7. Find the speed of light in Ruby. The speed of light in vacuum is 3 × 10⁸ m/s.

Answer

μ = Speed of light in vacuum / Speed of light in Ruby

μ = c/v

v = c/μ

c = velocity of light

μ = refractive index

v = (3 × 10⁸)/1.7

= 1.76 × 10⁸ m/s