阿贝常数

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)。

V_d = \frac{n_d -  1}{n_f - n_c}

这里, V_d 表示在 \lambda = 588 nm时的V数, n_f 表示在 \lambda = 486 nm时的f光折射率, n_c 表示在 \lambda = 656 nm时的c光折射率, n_d 表示在 \lambda = 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).

V_d = \frac{n_d - 1}{n_f - n_c}

where V_d = V-value at \lambda = 588 nm, n_f = index of refraction at \lambda = 486 nm, n_c = index of refraction at \lambda = 656 nm, and n_d = index of refraction at \lambda = 588 nm. The reciprocal of dispersive power.

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