Objective lens
Objective Lens
The Objective Lens (pronunciation: /əbˈdʒɛktɪv lɛnz/) is a critical component in Optical instruments such as Microscopes and Telescopes. It is the lens (or system of lenses) at the end of a microscope or telescope closest to the object being observed.
Etymology
The term "Objective Lens" originates from the Latin word "Objectum" which means "something presented to the mind". The term "Lens" is derived from "Lens culinaris", the Latin name for a lentil, because a double-convex lens is lentil-shaped.
Function
The primary function of the Objective Lens is to gather light from the object being observed and focus the light rays to produce a real image. This image can be magnified by a second lens, known as the Eyepiece, to allow the observer to view the object in detail.
Types of Objective Lenses
There are several types of Objective Lenses, each designed for specific applications. These include:
- Achromatic Lenses: These lenses are designed to limit the effects of chromatic and spherical aberration. They are commonly used in microscopes.
- Apochromatic Lenses: These lenses provide better correction of chromatic and spherical aberration than achromatic lenses. They are often used in high-quality microscopes.
- Oil Immersion Lenses: These lenses are designed to be used with a drop of oil between the lens and the specimen. The oil improves the resolution of the image by reducing the amount of light scatter.
Related Terms
- Eyepiece: The lens or group of lenses that the observer looks through in a microscope or telescope.
- Focal length: The distance between the center of a lens and the point where it focuses light rays.
- Resolution: The ability of a lens to distinguish small details of an object.
External links
- Medical encyclopedia article on Objective lens
- Wikipedia's article - Objective lens
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