Various dielectric coatings can be deposited upon request
Penta prism's function is to deviate the direction of the light beam
by 90 degrees. Penta prism will neither invert nor reverse the
image. Penta prisms are extremely useful in alignment systems
as they define a right angle very precisely and independently
of angle of incidence. Rays entering one face emerge from the
adjacent face at precisely 90 deg after they have undergone two
reflections inside the prism for a total of 270 deg. The penta prism
acts as a turning mirror which is insensitive to alignment.
