Special Features:

2material used in the manufacture of this optical part shall not containthorium, other radioactive material, or any combination of nuclear material inexcess of 0.05 percent by weight as defined by the title 10, code of federal regulations, part 40

Properties:

An unmounted, transparent, color free lens which may be treated with a low reflection coating to increase light transmission. Includes single and compound elements. For items having two plane parallel surfaces, see window, optical instrument. Excludes reticle, optical instrument.