Light transmission guide
It can be a series of lenses as in a microscope with built in light supply or a fiber optic cable
-Some microscope have internal lenses, mirrors and prisms that bend the light on to the surgical field
-Fiber optic transmission guide is composed of many individual glass fibers randomly selected and encased in protective sheath
Focusing lens
-Light exiting from an internal lighting system or a fiber optic cable must be concentrated in the field of view
-Concentration is done through the objective lens or through an accessory objective lens
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