Icon class icon_class fas fa-quote-left icon_class_computed fas fa-quote-left Related content An object infinitely far from the optical system forms an image at the rear focal plane Source Wikipedia Copyright information Text from Wikipedia and Wiktionary web pages quoted for educational purposes is subject to the Wikipedia Creative Commons Attribution ShareAlike Licence Snippet kind INFO Keywords optics focal plane rear focal plane Previous snippet Full quote An object infinitely far from the optical system forms an image at the rear focal plane. URL https://en.wikipedia.org/wiki/Cardinal_point_(optics) Next snippet Related snippets Related snippets (backlinks) The front and rear (or back) focal planes are defined as the planes, perpendicular to the optic axis, which pass through the front and rear focal points. If the medium surrounding the optical system has a refractive index of 1 (e.g., air or vacuum), then the distance from the principal planes to their corresponding focal points is just the focal length of the system. A principal focus or focal point is a special focus: For a lens, or a spherical or parabolic mirror, it is a point onto which collimated light parallel to the axis is focused. rays that enter the system parallel to the optical axis are focused such that they pass through the rear focal point Visit also Visit also (backlinks) Flags
