定义:
(也称V数或v数)描述一个光学介质的折射率和色散能力的比值的常数。高V数表示对所有波长的折射近似相等(棱镜的色散较小)。
这里, 表示在
= 588 nm时的V数,
表示在
= 486 nm时的f光折射率,
表示在
= 656 nm时的c光折射率,
表示在
= 588 nm时的d光折射率。色散平方的倒数。
English Expression:
Abbe condenser
Definition:
(also V-value or v-value). The constant of an optical medium that describes the ratio of its refractivity to its dispersion. A high V-value indicates more nearly equal refraction at all wavelengths (less rainbow from a prism).
where = V-value at
= 588 nm,
= index of refraction at
= 486 nm,
= index of refraction at
= 656 nm, and
= index of refraction at
= 588 nm. The reciprocal of dispersive power.
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