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Reflaction and Telescope Optics C017 / 3507
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Reflaction and Telescope Optics C017 / 3507
Plate from 18th century encyclopedia showing diagrams of telescope optics, and light raypaths through prisms and lenses to the eye. An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is so named because it is usually the lens that is closest to the eye when someone looks through the device. The objective lens or mirror collects light and brings it to focus creating an image. The eyepiece is placed near the focal point of the objective to magnify this image. The amount of magnification depends on the focal length of the eyepiece. Two drawings illustrate lightpaths through reflecting telescopes, one showing the rays reflected by an angled flat mirror through 90 degrees to an eyepiece, the other reflected back through a hole in the primary mirror
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Media ID 9340069
© DAVID PARKER/SCIENCE PHOTO LIBRARY
Concave Convex Encyclopedia Eyepiece Focal Point Human Eye Image Lens Lenses Light Magnification Magnify Microscope Mirror Objective Ocular Optics Primary Mirror Prism Reflection Refraction Spectrum Telescope
EDITORS COMMENTS
This print from the 18th-century encyclopedia showcases the intricate world of telescope optics and refraction. The image depicts a series of detailed diagrams, shedding light on the fascinating journey of light rays through prisms and lenses to reach our eyes. At the heart of this optical marvel lies the eyepiece, an essential lens that attaches itself to various devices like telescopes and microscopes. Positioned closest to our eye when peering through these instruments, it plays a crucial role in bringing images into focus. Working in tandem with the objective lens or mirror, which collects incoming light and creates an image, the eyepiece magnifies this image by being placed near its focal point. The amount of magnification achieved depends on the focal length of the eyepiece, allowing us to explore distant celestial bodies or delve deeper into microscopic wonders. Two drawings within this print illustrate different light paths through reflecting telescopes: one demonstrates rays reflected by an angled flat mirror at a 90-degree angle towards an eyepiece; while another shows rays reflected back through a hole in the primary mirror. With elements such as mirrors, prisms, lenses, and even spectrums coming together harmoniously within this composition, we are reminded of humanity's ceaseless curiosity about understanding our universe. This visual representation serves as both a testament to scientific progress throughout history and an inspiration for future discoveries yet to be made.
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