Aucbvax.7048
net.misc
utzoo!decvax!ucbvax!halbert
Tue May  4 13:16:48 1982
Polarization experiment
Here's a cute experiment from a book called "Are Quanta Real?":

Take two polarizing filters and set them up so their polarizing axes
are perpendicular. Shine a light through. You don't see the light, right?

	light---->  |-    (> eye

Now take another filter and put its axis at 45 degrees on either side of
the pair. Again, you see no light:

	     ---->  /|-   (>		or
	     ---->  |-/   (>

Now put the third filter in between the first two, again at 45 degrees.
What do you see? (Hint: it's not what you saw before.)

	     ---->  |/-   (>


--Dan