Firekist
09-19-2007, 09:32 PM
and you might have this lying around your house:
2 polarized lenses. cameras often have these (the lens is able to rotate)
good sunglasses have them.
1 light source (flashlight or mini lamp)
take a lens, put it over the light.
take 2nd lens, put it near your eye. rotate either lens until the light gets dark. as the polarization lines become perpendicular, the light is blocked by the 2nd lens.
put glass inbetween the lenses.. clear stuff works well
the dark bands you see are stress.. look at a point.
i only bring this up, because bigles and i finally got around to trying it. there are better ways.. but.. if you have these lying around, it's neat to see.
z--seth
2 polarized lenses. cameras often have these (the lens is able to rotate)
good sunglasses have them.
1 light source (flashlight or mini lamp)
take a lens, put it over the light.
take 2nd lens, put it near your eye. rotate either lens until the light gets dark. as the polarization lines become perpendicular, the light is blocked by the 2nd lens.
put glass inbetween the lenses.. clear stuff works well
the dark bands you see are stress.. look at a point.
i only bring this up, because bigles and i finally got around to trying it. there are better ways.. but.. if you have these lying around, it's neat to see.
z--seth