You use different lenses underwater because the speed of lightis different

Frank Pittel wrote:

In rec.photo.equipment.35mm Michael Weinstein wrote:
: On 2006-04-24 17:27:28 -0400, "alex" said:

:
: "Dave Hillstrom" wrote in message
: oups.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.
:
:
: Someone wasn't concentrating in Physics at school...

: No, I think someone didn't actually TAKE Physics in school.

When I was taking physics light traveled slower in water then in air.

Yeah, but back then, we had to walk 5 miles barefoot through the snow
and it was uphill both ways.

In rec.photo.equipment.35mm no_name wrote:
: Frank Pittel wrote:

: In rec.photo.equipment.35mm Michael Weinstein wrote:
: : On 2006-04-24 17:27:28 -0400, "alex" said:
:
: :
: : "Dave Hillstrom" wrote in message
: : oups.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.
: :
: :
: : Someone wasn't concentrating in Physics at school...
:
: : No, I think someone didn't actually TAKE Physics in school.
:
: When I was taking physics light traveled slower in water then in air.

: Yeah, but back then, we had to walk 5 miles barefoot through the snow
: and it was uphill both ways.

I used to pocket the money and walked to school. It was two miles each way and
I walked through the rain and snow. I did have shoes though and I haven't read
anything about the laws of physics changing since then.
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