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Re: various comments on lighting.
<snip>> For water and glass at an index of refraction near 1.5, the critical
> is about 45 degrees. Light hitting the inside of the glass-air surface at
> the critical angle is bent (refracted) to propagate parallel to the glass
> surface, and anything at greater angle suffers total internal reflection.
> The reverse is true at the water air interface above. Horizontal light is
> bent down to 45 degrees inside the tank, hence it can't get out through the
> glass until redirected.
> Hope that helps more than confuses.
I think so. So when I stand in front of the tank, and the sides look like
mirrors, it's this critical angle thing at work. If That's correct, then I