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  2. Abbe number - Wikipedia

    en.wikipedia.org/wiki/Abbe_number

    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 ...

  3. Abbe sine condition - Wikipedia

    en.wikipedia.org/wiki/Abbe_sine_condition

    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 ...

  4. Chromatic aberration - Wikipedia

    en.wikipedia.org/wiki/Chromatic_aberration

    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 ...

  5. Low-dispersion glass - Wikipedia

    en.wikipedia.org/wiki/Low-dispersion_glass

    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 ...

  6. The One Look a Pet Behaviorist Is Begging Dog Owners to ... - AOL

    www.aol.com/one-look-pet-behaviorist-begging...

    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 ...

  7. 6 Signs Of A Happy Dog, According To Veterinarians - AOL

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    They have relaxed body language. “Happy dogs should have very loose body language,” Anderson said. “They shouldn’t have any tension. Their ears shouldn’t be pulled back. You shouldn’t ...

  8. 9 Famous Pets Who Make More Bank Than Most Humans - AOL

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    Intend Marketing says that Nala Cat has a net worth of $100 million. Most of Nala Cat's income stems from her successful social media pages, where she boasts 60 million-and counting-followers ...

  9. Flint glass - Wikipedia

    en.wikipedia.org/wiki/Flint_glass

    Flint glass is optical glass that has relatively high refractive index and low Abbe number (high dispersion ). Flint glasses are arbitrarily defined as having an Abbe number of 50 to 55 or less. The currently known flint glasses have refractive indices ranging between 1.45 and 2.00. Traditionally, flint glasses were lead glasses containing ...

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