Answer
Much of the reflected light is polarized.
Work Step by Step
The polarization direction is parallel to the direction of the reflecting surface.
This is discussed on page 556, and diagrammed in Figure 29.33.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.