In the rectangular prism below the angles are $=50$ and $=40$ while around the prism

there is air. In the prism is incident vertically, in a vertical seat, see figure, natural light

intensity $103$ W$/$m$2$ and propagates inside the prism with a speed of $2108$ m$/$s$.$ Find the tension

of the light that will emerge from the two other seats of the prism at first incidence

on both surfaces.