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Diagram of a simple microscope. There are two basic types of optical microscopes: simple microscopes and compound microscopes. A simple microscope uses the optical power of a single lens or group of lenses for magnification. A compound microscope uses a system of lenses (one set enlarging the image produced by another) to achieve a much higher ...
Binoculars diagram showing an Abbe–Koenig roof prism design. Roof prism binoculars, with the eyepiece in line with the objective. Although different prism systems ...
Eye examination with the aid of a slit lamp. Side view of a slit lamp machine. Cataract in human eye: magnified view seen on examination with the slit lamp. In ophthalmology and optometry, a slit lamp is an instrument consisting of a high-intensity light source that can be focused to shine a thin sheet of light into the eye.
Description: Binocular compound microscope from 1914; Carl Zeiss (1816–88), Jena, Germany; materials: brass, metal, glass; owner: The Golub Collection, University ...
Angular field of view is typically specified in degrees, while linear field of view is a ratio of lengths. For example, binoculars with a 5.8 degree (angular) field of view might be advertised as having a (linear) field of view of 102 mm per meter. As long as the FOV is less than about 10 degrees or so, the following approximation formulas ...
Binocular Compound Lab Microscope. This compound lab microscope is fairly compact and ideal for advanced high school and college students. It features eight magnification settings up to 2,000 ...
Pseudoscopic binocular microscope design by Father Cherubin d'Orleans, 1677. Before the pseudoscope itself was created intentionally, it existed in binocular instruments as an imperfection. The first binocular microscope was invented by the Capuchin friar Cherubin d'Orleans. Because his instrument consisted of two inverting systems, it produced ...
Double Porro prism systems are used in small optical telescopes to re-orient an inverted image (an arrangement is known as an image erection system), and especially in many binoculars where they both erect the image and provide a longer, folded distance between the objective lenses and the eyepieces. When there is an air gap between the two ...