B.5.4:5.1 - Glare from water

You want to reduce glare in an image. Identify air, water, a selected interface patch, incoming light and the direction from that patch to the camera. Draw the local normal and incidence plane. For unpolarized illumination of a smooth dielectric interface at Brewster incidence, reflected light is polarized perpendicular to that plane. Rotating a linear polarizer before the camera changes the transmitted reflected contribution. This is the domain relation supplied by Feynman, I.33, §33-4.

The interpretation tells you what to adjust. Moving the viewpoint changes incidence; ripples change local normals, so a single planar sketch may need several patches. Inspect a changed view and determine whether the proposed adjustment still follows.