Does Light Slow Down In Glass?

You have heard that light only goes at 300,000,000 m/s in the vacuum and that it goes slower in materials. Is that actually true? Maybe not. It depends...
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VIDEO ANNOTATIONS

Is Math the Language of the Universe?
   • Is Math the Language of the Universe?  

Does Light Have Mass?
   • Why Doesn't Light Have Mass?  

Why Are Some Things Transparent?
   • Why Are Some Things Transparent?  
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HUGE THANK YOU TO THESE PATRONS:

** Nikko Lai, Andy Kirkham, Evgeny **
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EXTRA INFO LINKS

Sixty Symbols on Light Slowing:
   • Why is light slower in glass? - Sixty...  
   • More rambling on Refraction - Sixty S...  

Huygen's Principle:
https://en.wikipedia.org/wiki/Huygens...

Fermat's Principle:
http://hyperphysics.phy-astr.gsu.edu/...

Wave Interference:
http://hyperphysics.phy-astr.gsu.edu/...
https://en.wikipedia.org/wiki/Interfe...)
http://www.physicsclassroom.com/class...

Refractive Index:
http://hyperphysics.phy-astr.gsu.edu/...
http://hyperphysics.phy-astr.gsu.edu/...
http://www.engineeringtoolbox.com/ref...
https://en.wikipedia.org/wiki/Refract...

Drag:
http://hyperphysics.phy-astr.gsu.edu/...
http://hyperphysics.phy-astr.gsu.edu/...
https://en.wikipedia.org/wiki/Drag_(p...)
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LIGHT SLOWS COMMENTS

TJF588:
   • Why Doesn't Light Have Mass?  

Tommy WizOh:
   • Why Doesn't Light Have Mass?  

Tony Skagerlund:
   • Why Doesn't Light Have Mass?  

Noah Keith:
   • Why Doesn't Light Have Mass?  
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COMMENT RESPONSES

frib75 - Math isn't a Language:
   • Is Math the Language of the Universe?  

ScienceMaths2012 - Physical Axioms:
   • Is Math the Language of the Universe?  

Thedarkfly - Symbols in what Langauge:
   • Is Math the Language of the Universe?  

Rick Clark - Units of Measure:
   • Is Math the Language of the Universe?  
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