In optics, an image-forming optical system is a system capable of being used for imaging. The diameter of the aperture of the main objective is a common...

flaws in the optical elements. An image-forming optical system with aberration will produce an image which is not sharp. Makers of optical instruments...

An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism...

78-inch (200 cm) Focault siderostat for aiming light into the Image-forming optical system part of the telescope, which had a 125 cm diameter lens. Using...

with the phenomena of reflected light and image-forming optical systems using mirrors. A catoptric system is also called a catopter (catoptre). Catoptrics...

types employ “correctors”, a lens or curved mirror in a combined image-forming optical system so that the reflective or refractive element can correct the...

An optical telescope gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual...

Optical resolution describes the ability of an imaging system to resolve detail, in the object that is being imaged. An imaging system may have many individual...

term image (or optical image) refers specifically to the reproduction of an object formed by light waves coming from the object. A volatile image exists...

to be used for cloud computing, ISO images are intended to emulate optical media, such as a CD-ROM. Raw disk images are used for forensic purposes. Proprietary...

response of a focused optical imaging system to a point source or point object. A more general term for the PSF is the system's impulse response; the...

real optical systems. Cardinal points provide a way to analytically simplify an optical system with many components, allowing the imaging characteristics...

In optics, any optical instrument or system – a microscope, telescope, or camera – has a principal limit to its resolution due to the physics of diffraction...

reflection and refraction) Optical telescope List of telescope types Image-forming optical system Schwartz, Steven H. (2019). Geometrical and visual optics a clinical...

Super-resolution imaging (SR) is a class of techniques that improve the resolution of an imaging system. In optical SR the diffraction limit of systems is transcended...

image is on the same side as the object while the virtual image is on the opposite side of, or "behind", the mirror. In diagrams of optical systems,...

image f formed in the input plane into a different image g formed in the output plane. The optical system output image g is related to the input image f by...

and optical coherence tomography; non-coherent imaging systems include fluorescent microscopes, optical microscopes, and telescopes. Chemical imaging, the...

ray tracing, which are used to find basic properties of optical systems, such as approximate image and object positions and magnifications. Reflections can...

meniscus lens that is used to correct spherical aberration in image-forming optical systems such as catadioptric telescopes. It works by having the equal...

reflectors. Many variant forms are in use and some employ extra optical elements to improve image quality or place the image in a mechanically advantageous...

image is one that appears right-side up. An image is formed when rays from a point on the original object meet again after passing through an optical...

will be read, though many systems will ignore marks that are the same color the form is printed in. This also allows optical answer sheets to be double-sided...

Optical character recognition or optical character reader (OCR) is the electronic or mechanical conversion of images of typed, handwritten or printed text...

Angular resolution describes the ability of any image-forming device such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish...

image and build a mental model of the surrounding environment. The visual system is associated with the eye and functionally divided into the optical...

camera modules, camera phones, optical mouse devices, medical imaging equipment, night vision equipment such as thermal imaging devices, radar, sonar, and...

Optical coherence tomography (OCT) is a high-resolution imaging technique with most of its applications in medicine and biology. OCT uses coherent near-infrared...

processing. In all cases, the magnification of the image does not change the perspective of the image. Some optical instruments provide visual aid by magnifying...

special optical lens (often an objective lens or a camera lens) that has its entrance or exit pupil, or both, at infinity. The size of images produced...