Reflectors used in optical instruments
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SPECULAReflectors used in optical instruments.
tourmalineA brittle gray or black mineral that occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and polarizing properties, and is used in electrical and optical instruments and as a gemstone
tourmalinesA brittle gray or black mineral that occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and polarizing properties, and is used in electrical and optical instruments and as a gemstone
LENSESDevices in optical instruments
ZEISSFamous name in optical instruments.
PERISCOPEOptical instrument used in trenches.
thoriaa powdery white oxide of thorium ThO2 used especially as a catalyst and in crucibles and refractories and optical glass
theodoliteoptical tracking instrument consisting of a camera and theodolite mounted on a single tripod, used in photogrammetry and in tracking rockets
laserdiscsA disk that resembles a compact disc and functions in a similar manner; an optical disc. It is used mainly for high-quality video and for interactive multimedia on computer
laserdiscA disk that resembles a compact disc and functions in a similar manner; an optical disc. It is used mainly for high-quality video and for interactive multimedia on computer
lenseda piece of transparent material (as glass) that has two opposite regular surfaces either both curved or one curved and the other plane and that is used either singly or combined in an optical instrument for forming an image by focusing rays of light