A laser is mounted in air, at a distance of 0.476 m above the edge of a

Question:

A laser is mounted in air, at a distance of 0.476 m above the edge of a large, horizontal pane of crown glass, as shown in the drawing. The laser is aimed at the glass in such a way that the reflected beam is 100% polarized. Determine the distance d between the edge of the pane and the point at which the laser beam is reflected.