Quote:
Originally Posted by wet
... Invertebrates have polarized vision? ..
I thought polarized vision didn't work under water, only above water looking through the reflection.  |
Okay, for invertebrates having polarized vision, yes, some do. For example bees use polarized vision to be able to locate the sun even under cloudy skies and thus be able to navigate accordingly.
Goldfish are vertebrates, though. (They have vertebrae
)
As for having an effect under water: Polarized vision will have an effect wherever there is polarized light to be seen, which can be anywhere. The thing with polarized lenses for (above-)water sports is just that a portion of the light, when reflected especially at a low angle (e.g. by the surface of the water) becomes polarized, so a polarized lens allows one to selectively filter out the glare from the water. So the overall amount of light available is still relatively high, but the glare is gone.
This is also why, with polarized lenses, it's easier to look through windows in daylight: The reflected images on the window pane get filtered out and only the light coming
through the window is left.
phew!...
Wow! This must be about the third time that physics 101 has helped me in real life!
