Lens Cases

Top Articles

Thin lens - In optics, a thin lens is a lens with a thickness (distance along the optical axis between the two surfaces of the lens) that is negligible compared to the focal length of the lens. If the thickness of the lens is not neglected, it is called a thick lens.

Gravitational microlensing - ... lensing effect of a foreground compact mass, such as a planet or star, as it passes very close to the line of sight to a more distant source, such as a star or a quasar. The distinguishing characteristic between microlensing and other cases of gravitational lensing is that the multiple distorted images of the source which the lens may induce are not individually resolvable by optical telescopes.

Hyperopia - Hyperopia, also known as hypermetropia or colloquially as farsightedness or longsightedness, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or when the lens cannot become round enough), causing inability to focus on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves towards the eye, the eye must increase its power to keep the image on the retina.

Central shutter - In photography, a central shutter is a type of camera shutter, so called because in many cases it is contained within the lens body itself, at the convergent image point.

Suggested Web Sites

Lens an Astrophysicist! - Interactive Java applet by Pete Kernan (Case Western Reserve University) that allows the visitor to take any of a number of images of astrophysicists, or specify an image by its URL, and explore how it would be distorted by different kinds of gravitational lensing effect.

Metro Optics Eyewear - State-of-the-art on-site lab provides same-day lens fabrication at two Bronx locations. Eye exams, expert fitting by NY State licensed optometrists and opticians. Co-management; cataract, glaucoma, pathological eye disorder cases.

Tibetan Terrier International - Information about the latest and the coming World Congress. TIIS List covering Lens Luxation and PRA cases is offered as well as Forum related to TTs.

Source: BazSites.com

Web Links

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