21. This time the optical element was a globe cut in half, with black concentric circles painted on it. 22. These bores could also utilize linear bearings, and micrometers for precise linear, and X-Y positioning of optical elements . 23. The most important optical element is a large, curved mirror that takes in the light and precisely focuses it. 24. A curved primary mirror is the reflector telescope's basic optical element that creates an image at the focal plane. 25. The primary optical elements of reflectors are mirrors, and they come in a wide variety of designs and mountings. 26. Adjustment of the sextant consists of checking and aligning all the optical elements to eliminate " index correction ". 27. This is simply the diameter of the primary optical element -whether lens or mirror, measured in either inches or millimeters. 28. This was called Macrobench which consisted of 150x150 mm mounting plates capable of securing up to 110 mm optical elements . 29. The technology is based on a new head design that aims to integrate optical elements into a more traditional head. 30. Besides, linear optical elements of optical systems may be the simplest building blocks to realize quantum operations and quantum gates.
