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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.

Funny thing. You are about half right, almost.

Yea, light travels at different speeds. It even is different in glass,
or different kinds of glass. That has been known for a long time.

It does means that the focusing scale marked on the lens is not going to
be correct, but it does not mean the lens needs to be changed.

--
Joseph Meehan

Dia duit



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