This is in the base of the stand at the foot of the microscope. In research microscopes, it is made up of a Light source (1), a set of Lenses (2) which allow a parallel beam of light to be obtained to avoid the loss of intensity by dispersion, an anti-thermic filter (3) which prevents the other elements from overheating, a set of chromatic filters (4) which allow the chromatic characteristics of the light to be modified, a mirror (5) to orient the light beam in the correct direction and an iris diaphragm (6) to regulate the light intensity and breadth of the beam.
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