From: Ron Kean (ronkean@juno.com)
Date: Sun Feb 21 1999 - 09:48:52 MST
On Sun, 21 Feb 1999 06:57:16 EST CALYK@aol.com writes:
>In a message dated 2/21/99 4:25:35 AM Central Daylight Time,
>JGanong@webtv.net
>writes:
>
><< It's 1999 all right. We'll have stardrives yet. Come to think of
>it, I
> drove
> faster than light today. >>
>
>I was under the impression light always travels the same speed, but
>is
>diverted on a longer path when it appears to be going slower?
>
>danny
>
The index of refraction of vacuum is 1. The index of refraction of air
is a little more than 1. Glass is about 1.4. Diamond is about 2.4. The
speed of light in a transparent material medium is slowed relative to the
speed in vacuum in proportion to the refractive index. Light speed
through a material with a refractive index of 2 is half the speed in a
vacuum.
Ron Kean
.
.
.
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