12. The speed of light in vacuum and in two different glasses is given in the table below : Medium Speed of light Vacuum 3.00 x 108 m/s Flint glass 1.86 x 108 m/s Crown glass 1.97 x 108 m/s

The speed of light in vaccum and in two different glasses is given in the table below: a) Calculate the absolute refractive indexes of flint glass and crown glass. b) Calculate the relative index for light going from crown glass to flint glass.

The refractive index of glass is 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3.0 × 10^8 m s )

The speed of light in a transparent medium having absolute refraction index 1.25 is "…....................." [Speed of light in vacuum ~~3 xx10^(8) m//s ]