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Terms
  • iris diaphragm A mechanical device designed to smoothly vary the effective diameter of a lens, thereby controlling the amount of light allowed through.  
  • aperture diaphragm The second adjustable iris diaphragm in an optical system. In the common microscope condenser system, it usually is located beneath the substage condenser on a transmitted light microscope. When the aperture diaphragm is adjusted, the intensity of...
  • light Electromagnetic radiation detectable by the eye, ranging in wavelength from about 400 to 750 nm. In photonic applications light can be considered to cover the nonvisible portion of the spectrum which includes the ultraviolet and the infrared.
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