[thechat] Speed of light may have changed recently

deacon web at master.gen.in.us
Sun Jul 4 12:03:43 CDT 2004

On 4 Jul 2004 at 14:10, John Handelaar wrote:
> a)  Isn't this old news?  Only the other month we were treated
>     to news that some lab had managed to cut the speed of light
>     to a relatively leisurely 28 mph

People forget that c is the speed of light IN A VACUUM. 
The speed of light varies in other media. 

299 792 458 m/s in a vacuum
299 702 547 m/s in air
228 849 204 m/s in ice
225 407 863 m/s in water
199 861 638 m/s in water
                  0 m/s in asphalt

A lens works because it changes the speed of light. The ratio at which 
light is slowed down is called the refractive index.


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