Reflection and refraction of a <a href="https://en.wikipedia.org/wiki/en:plane_wave" class="extiw" title="w:en:plane wave">plane wave</a> at the <a href="https://en.wikipedia.org/wiki/en:Brewster%27s_angle" class="extiw" title="w:en:Brewster's angle">Brewster's angle</a> : unpolarised light is reflected as totally transverse electrical, the transmitted beam is partially polarised in the transverse magnetical direction.  Are drawn and labelled : incoming and refracting angles, magnetic (B) and electric (E) fields, the right angle between reflected and refracted waves.
<a href="//commons.wikimedia.org/wiki/User:%D0%94.%D0%98%D0%BB%D1%8C%D0%B8%D0%BD" title="User:Д.Ильин">Д.Ильин</a>: translation, optimization
<a href="//commons.wikimedia.org/wiki/File:Brewsters-angle.svg" title="File:Brewsters-angle.svg">File:Brewsters-angle.svg</a> by <a href="//commons.wikimedia.org/w/index.php?title=User:Pajs&amp;action=edit&amp;redlink=1" class="new" title="User:Pajs (page does not exist)">Pajs</a>