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Skippy25
join:2000-09-13
Hazelwood, MO

Skippy25

Member

Seriously guys....

The speed of light as we know it is light in a vacuum. Fiber does not run at that speed and can't because it is 1.) Not in a vacuum and 2.) Running across a cable that introduces some resistance.
JPL
Premium Member
join:2007-04-04
Downingtown, PA

JPL

Premium Member

said by Skippy25:

The speed of light as we know it is light in a vacuum. Fiber does not run at that speed and can't because it is 1.) Not in a vacuum and 2.) Running across a cable that introduces some resistance.

Vacuum? Per Einstein, that's utterly irrelevent. The speed of light is fixed. Period.
Paxio
Premium Member
join:2011-02-23
Santa Clara, CA

Paxio

Premium Member

said by JPL:

Vacuum? Per Einstein, that's utterly irrelevent. The speed of light is fixed. Period.

Well... it's not quite that simple!

Glass fibers have an index of refraction of about 1.5, which means the speed of light traveling in a glass fiber is 1.5 times slower than the speed of light in a vacuum. The speed of light in vacuum is though to be an absolute constant, per Einstein et. al.

»en.wikipedia.org/wiki/Re ··· ve_index
prairiesky
join:2008-12-08
canada

prairiesky to JPL

Member

to JPL
said by JPL:

said by Skippy25:

The speed of light as we know it is light in a vacuum. Fiber does not run at that speed and can't because it is 1.) Not in a vacuum and 2.) Running across a cable that introduces some resistance.

Vacuum? Per Einstein, that's utterly irrelevent. The speed of light is fixed. Period.

huh?. It has different speeds through different mediums
Body Count
join:2010-09-11
Columbus, OH
Netgear CM1000
Ubiquiti EdgeRouter ER-4
Ubiquiti U6-Pro

Body Count to JPL

Member

to JPL
said by JPL:

said by Skippy25:

The speed of light as we know it is light in a vacuum. Fiber does not run at that speed and can't because it is 1.) Not in a vacuum and 2.) Running across a cable that introduces some resistance.

Vacuum? Per Einstein, that's utterly irrelevent. The speed of light is fixed. Period.

the famous speed of light number is actually when in a vacuum. when light travels through transparent objects, it will slow down. Just like when light travels through water it will slow down.. then when it's out of water it will speed back up again. Know your physics before posting.