TRAIL: Webel SysML Parsing Analysis example: Optical telescopes from Wikipedia: Structure and port-based light flow model
An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum
The objective is the optical element that gathers light from the object being observed and focuses the light rays
An eyepiece is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes.
The Gregorian telescope employs a concave secondary mirror that reflects the image back through a hole in the primary mirror.