The light transmission through an endoscope is achieved by way of:

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Endoscopic light is often referred to as cold light,meaning that the heat from the light source is not transmitted through the length of the scope.Fiberoptic endoscopes have an eyepiece with a lens for visualization;the image is carried through the endoscope via a bundle of tiny glass fibers.In 1966 the rod-lens system designed by the British optical physicist Hopkins improved brightness and clarity.

The Light Transmission Through an Endoscope Is Achieved by Way