#445.  Optical Instruments. —­ N. optical instruments; lens, meniscus,
magnifier, sunglass, magnifying glass, hand lens; microscope, megascope[obs3], tienoscope[obs3].
     spectacles, specs [coll.],glasses, barnacles, goggles, eyeglass,
pince-nez, monocle, reading glasses, bifocals; contact lenses, soft lenses, hard lenses; sunglasses, shades[coll.].
     periscopic lens[obs3]; telescope, glass, lorgnette; spyglass, opera
glass, binocular, binoculars, field glass; burning glass, convex lens, concave lens, convexo-concave lens[obs3], coated lens, multiple lens, compound lens, lens system, telephoto lens, wide-angle lens, fish-eye lens, zoom lens; optical bench.
     astronomical telescope, reflecting telescope, reflector, refracting
telescope, refractor, Newtonian telescope, folded-path telescope, finder telescope, chromatoscope; X-ray telescope; radiotelescope, phased-array telescope, Very Large Array radiotelescope; ultraviolet telescope; infrared telescope; star spectroscope; space telescope.
     [telescope mounts] altazimuth mount, equatorial mount.
     refractometer, circular dichroism spectrometer.
     interferometer.
     phase-contrast microscope, fluorescence microscope, dissecting
microscope; electron microscope, transmission electron microscope; scanning electron microscope, SEM; scanning tunneling electron microscope.
     [microscope components] objective lens, eyepiece, barrel, platform,
focusing knob; slide, slide glass, cover glass, counting chamber; illuminator, light source, polarizer,
     [component parts of telescopes] reticle, cross-hairs.
     light pipe, fiber optics
     mirror, reflector, speculum; looking-glass, pier-glass, cheval-glass,
rear-view mirror, hand mirror, one-way mirror, magnifying mirror.
     [room with distorting mirrors] fun house.
     prism, diffraction grating; beam splitter, half-wave plate, quarter-
wave plate.
     camera lucida[Lat], camera obscura[Lat]; magic lantern &c. (show) 448;
stereopticon; chromatrope[obs3], thaumatrope[obs3]; stereoscope, pseudoscope[obs3], polyscope[obs3], kaleidoscope.
     photometer, eriometer[obs3], actinometer[obs3], lucimeter[obs3],
radiometer; ligth detector, photodiode, photomultiplier, photodiode array, photocell. 
     X-ray diffractometer, goniometer.
     spectrometer, monochrometer, UV spectrometer, visible spectrometer,
Infrared spectrometer, Fourier transform infrared spectrometer, recording spectrometer; densitometer, scanning densitometer, two-dimensional densitometer.
     abdominoscope[obs3], gastroscope[Med], helioscope[obs3],
polariscope[obs3], polemoscope[obs3], spectroscope.
     abdominoscopy[obs3]; gastroscopy[Med]; microscopy, microscopist.