Basic Optics Discipline: EducationRefractionLight travels through a vacuum at its maximum speed of about 3.0 × 108 m/s, and in a straight path. Light travels at slower speeds through different materials, such as glass or air. (A material through which light travels is called a medium, plural media.) When traveling from one medium to another, some light will be reflected at the surface of the new medium.Tags: seeingfield of viewlight rayreflectionrefration
How Telescopes Work Discipline: Education This guide describes how telescopes work. Telescopes are the fundamental tool in observational astronomy, and understanding their capabilities and limitations is central to understanding what we can learn from them. You will find that the text contains many links. Some will take you to a glossary definition, while others are links to more information about a topic you may want to explore further. Please use this guide in the way that makes most sense to you. You may want to read the entire guide first, then go back and follow links that interest you, or youTags: spectraopticsseeingrefractingreflectingCCDspectrographfield of viewangular resolution
