[Solved] What format must a code of business conduct take? Microscope: An instrument used to see objects that are too small for the naked eye, expanding our understanding of microscopic worlds. Condenser: A device or unit used to condense a substance from its gaseous to liquid state, commonly found in HVAC systems, refrigeration, and laboratory apparatus. Iris: The colored part of the eye that controls the size of the pupil and the amount of light reaching the retina. Substage: In microscopy, the part of the microscope below the stage, often housing the illuminator and condenser, used to adjust the intensity and focus of light on the specimen.