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2016-04-21 08:42:27
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https://en.wikipedia.org/wiki/Speed_of_light#In_a_medium
https://en.wikipedia.org/wiki/Refractive_index#Density
- In general, the refractive index of a glass increases with its density. However, there does not exist an overall linear relation between the refractive index and the density for all silicate and borosilicate glasses.
http://www.physicsclassroom.com/class/refrn/Lesson-1/Optical-Density-and-Light-Speed
- In the case of an electromagnetic wave, the speed of the wave depends upon the optical density of that material. The optical density of a medium is not the same as its physical density.
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