Objective (optics) - Wikipedia
In optical engineering, an objective is an optical element that gathers light from an object being observed and focuses the light rays from it to produce a real image of the object. Objectives can be a single lens or mirror, or combinations of several optical elements.
3.5: The Telescope - Physics LibreTexts
The first lens that it encounters is the object glass. Its function is to produce a real image in its focal plane, and the distance between the object glass and this primary image is \(f_1\), the focal length of the object glass.
3.6: The Microscope - Physics LibreTexts
The front lens of a microscope is generally called the “objective” lens, rather than the “object glass”. In contrast to the telescope, the objective is a small lens with a short focal length. The object is placed just outside the focal point of the objective, and a magnified real inverted primary image is formed quite some distance away ...
Object glass - Definition, Meaning & Synonyms - Vocabulary.com
2024年10月7日 · Definitions of object glass. noun. the lens or system of lenses in a telescope or microscope that is nearest the object being viewed. synonyms: object lens, objective, objective lens.
ZEISS Microscopy Online Campus | Microscopy Basics | Introduction
In its simplest form, the instrument is composed of two convex lenses aligned in series: An object glass (more commonly referred to as an objective) closer to the object or specimen, and an eyepiece (ocular) lens closer to the observer's eye (with means of adjusting the position of the specimen and the microscope lenses).
4.3: Astigmatism - Physics LibreTexts
The easiest way to understand the phenomenon of astigmatism is to imagine a lens (or mirror) whose surfaces are not exactly spherical but for which the radius of curvature (and hence focal length) in one plane is different from the radius of curvature in a plane at right angles to the first.
Object Glass Definition & Meaning - YourDictionary
Plural: object glasses. Object Glass Sentence Examples. The object glass of the micrometer-microscope is placed midway between the plane of the photographic plate and the plane of the micrometer webs. In the same year the duke of Northumberland presented the Cambridge observatory with a fine object-glass of 12 in.