Borescope
A rigid or flexible tube with an eyepiece or display on one end and an objective lens or camera on the other, connected with optical or electrical system, makes up a borescope, also known as boroscope. In some cases, the optical system is complemented by (usually fiberoptic) illumination to improve brightness and contrast. The objective lens creates an internal image of the lit object, which is magnified by the eyepiece and shown to the viewer's eye.
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