Get it on Google Play
New! Download Unionpedia on your Android™ device!
Faster access than browser!

Objective (optics)

Index Objective (optics)

In optical engineering, the objective is the optical element that gathers light from the object being observed and focuses the light rays to produce a real image. [1]

29 relations: Angular resolution, Camera, Camera lens, CD player, Eyepiece, F-number, Focal length, Focus (optics), Index-matching material, Lens (optics), List of telescope parts and construction, Magnification, Magnifying glass, Microscope, Mirror, Movie projector, Numerical aperture, Oil immersion, Optical aberration, Optical engineering, Primary mirror, Projector, Ray (optics), Real image, Reflecting telescope, Refracting telescope, Slide projector, Telescope, W. M. Keck Observatory.

Angular resolution

Angular resolution or spatial 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 small details of an object, thereby making it a major determinant of image resolution.

New!!: Objective (optics) and Angular resolution · See more »


A camera is an optical instrument for recording or capturing images, which may be stored locally, transmitted to another location, or both.

New!!: Objective (optics) and Camera · See more »

Camera lens

A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.

New!!: Objective (optics) and Camera lens · See more »

CD player

A CD player is an electronic device that plays audio compact discs, which are a digital optical disc data storage format.

New!!: Objective (optics) and CD player · See more »


An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes.

New!!: Objective (optics) and Eyepiece · See more »


The f-number of an optical system (such as a camera lens) is the ratio of the system's focal length to the diameter of the entrance pupil.

New!!: Objective (optics) and F-number · See more »

Focal length

The focal length of an optical system is a measure of how strongly the system converges or diverges light.

New!!: Objective (optics) and Focal length · See more »

Focus (optics)

In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge.

New!!: Objective (optics) and Focus (optics) · See more »

Index-matching material

In optics, an index-matching material is a substance, usually a liquid, cement (adhesive), or gel, which has an index of refraction that closely approximates that of another object (such as a lens, material, fiber-optic, etc.). When two substances with the same index are in contact, light passes from one to the other with neither reflection nor refraction.

New!!: Objective (optics) and Index-matching material · See more »

Lens (optics)

A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.

New!!: Objective (optics) and Lens (optics) · See more »

List of telescope parts and construction

No description.

New!!: Objective (optics) and List of telescope parts and construction · See more »


Magnification is the process of enlarging the appearance, not physical size, of something.

New!!: Objective (optics) and Magnification · See more »

Magnifying glass

A magnifying glass (called a hand lens in laboratory contexts) is a convex lens that is used to produce a magnified image of an object.

New!!: Objective (optics) and Magnifying glass · See more »


A microscope (from the μικρός, mikrós, "small" and σκοπεῖν, skopeîn, "to look" or "see") is an instrument used to see objects that are too small to be seen by the naked eye.

New!!: Objective (optics) and Microscope · See more »


A mirror is an object that reflects light in such a way that, for incident light in some range of wavelengths, the reflected light preserves many or most of the detailed physical characteristics of the original light, called specular reflection.

New!!: Objective (optics) and Mirror · See more »

Movie projector

A movie projector is an opto-mechanical device for displaying motion picture film by projecting it onto a screen.

New!!: Objective (optics) and Movie projector · See more »

Numerical aperture

In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light.

New!!: Objective (optics) and Numerical aperture · See more »

Oil immersion

In light microscopy, oil immersion is a technique used to increase the resolving power of a microscope.

New!!: Objective (optics) and Oil immersion · See more »

Optical aberration

Aberration in optics refers to a defect in a lens such that light is not focused to a point, but is spread out over some region of space, and hence an image formed by a lens with aberration is blurred or distorted, with the nature of the distortion depending on the type of aberration.

New!!: Objective (optics) and Optical aberration · See more »

Optical engineering

Optical engineering is the field of study that focuses on applications of optics.

New!!: Objective (optics) and Optical engineering · See more »

Primary mirror

A primary mirror (or primary) is the principal light-gathering surface (the objective) of a reflecting telescope.

New!!: Objective (optics) and Primary mirror · See more »


Acer projector, 2012 A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen.

New!!: Objective (optics) and Projector · See more »

Ray (optics)

In optics a ray is an idealized model of light, obtained by choosing a line that is perpendicular to the wavefronts of the actual light, and that points in the direction of energy flow.

New!!: Objective (optics) and Ray (optics) · See more »

Real image

In optics, a real image is an image which is located in the plane of convergence for the light rays that originate from a given object.

New!!: Objective (optics) and Real image · See more »

Reflecting telescope

A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image.

New!!: Objective (optics) and Reflecting telescope · See more »

Refracting telescope

A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope).

New!!: Objective (optics) and Refracting telescope · See more »

Slide projector

A slide projector is an opto-mechanical device for showing photographic slides.

New!!: Objective (optics) and Slide projector · See more »


A telescope is an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).

New!!: Objective (optics) and Telescope · See more »

W. M. Keck Observatory

The W. M. Keck Observatory is a two-telescope astronomical observatory at an elevation of 4,145 meters (13,600 ft) near the summit of Mauna Kea in the U.S. state of Hawaii.

New!!: Objective (optics) and W. M. Keck Observatory · See more »

Redirects here:

Microscope Objective, Microscope objective, Microscope objective lens, Object glass, Object glasses, Object lens, Object lenses, Objective (lens), Objective glass, Objective glasses, Objective lens, Objective lenses.


[1] https://en.wikipedia.org/wiki/Objective_(optics)

Hey! We are on Facebook now! »