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Abbe number. In optics and lens design, the Abbe number, also known as the V-number or constringence of a transparent material, is an approximate measure of the material's dispersion (change of refractive index versus wavelength), with high values of V indicating low dispersion. It is named after Ernst Abbe (1840–1905), the German physicist ...
In optics, the Abbe sine condition is a condition that must be fulfilled by a lens or other optical system in order for it to produce sharp images of off-axis as well as on-axis objects. It was formulated by Ernst Abbe in the context of microscopes. [ 1] The Abbe sine condition says that. the sine of the object-space angle should be ...
Low-dispersion glass ( LD glass) is a type of glass with reduced chromatic aberration, meaning the refractive index does not change as strongly with different wavelengths of light. In other words, the light passing through the glass has a smaller spread or dispersion between its constituent colors, resulting in a reduced " rainbow effect" at ...
According to pet behaviorists, "whale eye" is something that they would love for dog owners to take notice of. As dog behaviorist Kerry Stack, founder of Darwin Dogs Training, says, dog bites ...
“It’s a collage of moments,” says 63-year-old British painter Peter Spens about his art. While photographers manage to produce hundreds, if not thousands, of photos over numerous days of ...
First, a new dog breed must meet a list of criteria, such as a recorded 3-generation pedigree and a minimum population. Then, they will submit their breed information to the AKC Board of Directors ...
Chromatic aberration. Focal length of lens varies with the color of light. In optics, chromatic aberration ( CA ), also called chromatic distortion, color aberration, color fringing, or purple fringing, is a failure of a lens to focus all colors to the same point. [ 1][ 2] It is caused by dispersion: the refractive index of the lens elements ...
The worms have previously been found in pets in the U.S. Now, the discovery of the worms in a black bear has prompted renewed worries for humans.