Question: A lens is placed at the end of a bundle of optical fibers in an endoscope. The purpose of the lens is to make the

A lens is placed at the end of a bundle of optical fibers in an endoscope. The purpose of the lens is to make the light rays parallel before they enter the fibers (in other words, to put the image at infinity). What is the advantage of using a lens with the same index of refraction as the core of the fibers?

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