The speed of light with a wavelength of 656 nm in heavy flin

The speed of light with a wavelength of 656 nm in heavy flint glass is 1.82 times 10^8 m/s. What is the index of refraction of the glass at this wavelength?

Solution

Speed of light in flint glass v = 1.82 x10 ⁸ m/s

Speed of light vacuum c = 3 x10 ⁸ m/s

Index of refraction of the flint glass n = c / v

                                                     =(3 x10 ⁸) /(1.82 x10 ⁸ )

                                                     = 1.648