The refractive index of glass is 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3.0 × 108 m s−1) Refractive index of glass, μ = 1.5 Speed of light, c = 3 × 108 m/s Speed of light in glass is given by the relation `"v" = "c"/μ` = `(3 xx 10^8)/1.5` = 2 × 108 m/s Hence, the speed of light in glass is 2 × 108 m/s. Given: Refractive index of glass = 1.5 Speed of light in air = 3.0 × 108 m/s Speed of light in glass = ? Applying the formula for refractive index, we get: Refractive index of a medium = (Speed of light in air)/(Speed of light in medium) For glass: Refractive index of glass = (Speed of light in air)/(Speed of light in glass) (Speed of light in glass) = (Speed of light in air)/(Refractive index of glass) = (3.0 × 108)/1.5 = 2.0 × 108 m/s Concept: Reflection and Refraction of Plane Wave at Plane Surface Using Huygens' Principle - Refraction of a Plane Wave Is there an error in this question or solution? Open in App Suggest Corrections 6 |