Originally Posted by
revi
Sorry, I have to disagree wrt reflections in non-metallic surfaces (including water): such reflections are partially polarised,
and thus they are affected by a polariser (angle wrt to the sun is irrelevant though). One of the uses of a polarising
filter is the removal of reflections on water to see what's under the surface.
The glare you mention on a lawn is also composed of individual reflections on leaves, and as such removed (in part) by a polarising filter.
Note that this only works for reflections on non-metallic surfaces, metallic surfaces do not partially polarise the light. Thus
the reflection from the metal surface in a mirror is not removed by a polariser, where the reflection on the glass surface is.