The corrector plate also helps seal the tube assembly from air currents and provides mounting point for the diagonal mirror, eliminating the diffraction effects from a "spider" secondary support.

The telescope had a flat diagonal secondary mirror bouncing the light at a 90 angle to a Plano-convex eyepiece with a probable focal length of 4.5mm yielding his observed 35 times magnification.

The Newtonian telescope is a type of reflecting telescope invented by the British scientist Sir Isaac Newton (1642-1727), using a concave primary mirror and a flat diagonal secondary mirror.

Secondary mirrors in the form of an optically flat diagonal mirror are used to re-direct the light path in designs such as Newtonian reflectors.

A "spider" with its diagonal mirror, and a rack-and-pinion focusing device with eyepiece were then purchased and assembled.

Many newer MRI systems place a diagonal mirror above the eyes to allow the patient to look down the tunnel rather than at the bore wall immediately above their face.

It used a spherically ground metal primary mirror and a small diagonal mirror in an optical configuration that has come to be known as the Newtonian telescope.

Lurie modified the original design by Houghton by adding a diagonal mirror to direct the focused light outside the telescope tube as in a Newtonian telescope.

Pyramids have a single diagonal mirror, and form the primary mechanism for directing the path of the laser.

The surface of the prism facing the light acts the same as a standard diagonal mirror reflecting a small portion of the incoming light at 90 degrees into the eyepiece.