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




Dave Hillstrom wrote:
> 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.

So your thinking is that before Einstein people did not know about
this?

Scott


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