Abbe number

Alternate definitions of the Abbe number are used in some contexts.

Lower Abbe number meaning, amongst other things, increased chromatic aberration.

Flint glasses are arbitrarily defined as having an Abbe number of 50 to 55 or less.

Abbe numbers are used to classify glass and other optically transparent materials.

In the visible part of the spectrum, diffractives have an Abbe number of 3.5.

It is characterized by the Abbe number.

These include work on microscopes, the Abbe number and comparators-the last being very useful for the detection of minor planets.

This naturally occurring substance has the highest known Abbe number, indicating that the material has low dispersion.

Generally, lower Abbe numbers are a property of mid and higher index lenses that cannot be avoided, regardless of the material used.

A high refractive index material will generally have a small Abbe number, or a high optical dispersion.

Multi-wavelength Abbe refractometers can be used to easily determine a sample's Abbe number.

The Abbe number for a material at a particular refractive index formulation is usually specified as its Abbe value.

Since Abbe numbers are positive, one of the focal lengths must be negative, i.e., a diverging lens, for the condition to be met.

For optics in the visual range the amount of dispersion of a lens material is often quantified by the Abbe number .

COC materials offer exceptional transparency, low birefringence, high Abbe number and high heat resistance.

For impact resistance safety glass is offered at a variety of indexes at high Abbe number, but is still 2x the weight of plastics.

Flint glass is optical glass that has relatively high refractive index and low Abbe number (high dispersion).

Borate glasses have lower wavelength-refraction dependence in the blue region of spectrum than silicate glasses with the same Abbe number.

Since , and the Abbe numbers are positive-valued, the power of the second element in the doublet is negative when the first element is positive.

The eye's Abbe number is independent of the importance of the corrective lens's Abbe, since the human eye:

Material dispersion is often characterised by the Abbe number, which gives a simple measure of dispersion based on the index of refraction at three specific wavelengths.

Lenses are first designed using average index of refraction and dispersion (see Abbe number) properties published in the glass manufacturer's catalog and though glass model calculations.

An "'Abbe diagram"' is produced by plotting the Abbe number "V" of a material versus its refractive index "n".

Optically, borosilicate glasses are crown glasses with low dispersion (Abbe numbers around 65) and relatively low refractive indices (1.51-1.54 across the visible range).

A material's dispersion is measured by its Abbe number, V, with low Abbe numbers corresponding to strong dispersion.