Прямоугольная треугольная призма с зеркальным покрытием для

The light ray enters the prism along a normal and continues straight on until it hits the back face of the prism.Total internal reflection occurs here because light strikes the surface at 45 degrees
which is greater than the critical angle.The light ray then emerges from the prism along a normal
and so continues straight through the glass surface.This type of prism can be used in a periscope.

We could provides many kinds of high precision prisms, including Penta Prism, Beamsplitter Penta Prism, Right Angle Prism, and Corner Cube. Our micro Penta Prism and Right Angle Prism are widely used in optical communication, such as optical switches

A periscope prism or a periscope installation including such a prism in which in order to avoid reflection from said prism back to the object under observation, the entry surface, any internally reflecting surfaces and the exit surface of said prism are arranged to be at angles other than right angles to the path of the light incident thereon