Why does light travel slower thru glass or water than thru a vacuum?

Subject: Why does light travel slower thru glass or water than thru a vacuum?

Date: Sun Mar 22 23:04:05 1998
Posted by Frank Ermes
Grade level: other
School: n/a
City: Melbourne State/Province: Victoria
Country: Australia
Area of science: Physics
ID: 890629445.Ph

Message:


What is it about glass/air/water that causes the speed of light to 
drop below 300,000 km/sec?

Re: Why does light travel slower thru glass or water than thru a vacuum?

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