Abbe number

Abbe number

noun Optics.
the reciprocal of the dispersive power of a substance.
Also called nu-value, relative dispersion.


Origin:
see Abbe condenser

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Abbe number is always a great word to know.
So is gobo. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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