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Subject: Re: You use different lenses underwater because the speed of light is different



"Dave Hillstrom" wrote in message
news:1145843218.216398.119160@i39g2000cwa.googlegroups.com...
> You can't use regular lenses underwater, that's why you always see
> special cameras on ocean documentaries and such. People think it's
> because they need to be waterproof but the real reason is the speed of
> light underwater is different than in air and it makes the light bend
> at different angles through the lenses.
> Einstein proved it.
>

Can't remember who, but I'm sure it was someone other than Einstein that
first proved that the speed of light is constant only in a constant
medium -'c' is defined as its speed in a vacuum.


Peter



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