(1) If I have an assemtrical diverging glass lens, i.e. a lens with 2
different radii of curvatures, say R1 = +10 cm and R2 = +20 cm or R1 =
+10 cm and R2 = -20cm, I can calculate the focal length of these lenses
using the lens makers equation. But on a ray diagram, where,
geometrically is the focal length measured from?
(2) At "Brewster's angle" a reflected light ray is maximally polorized
parallel to the reflecting surface. What happens to the degree of
polorization of the reflected light ray at angles greater than
Brewster's angle, (of course all angles are measured from the normal
with the incident surface.)
-tony