Paraxial region

Japanese: 近軸域 - きんじくいき
Paraxial region

...In other words, the image point is sharp and not blurred. Such a region of space is called the paraxial region, and the light rays within it are called paraxial rays. The theory of image formation by paraxial rays is described below.

*Some of the terminology that refers to the "paraxial region" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…つまり像点は鮮鋭でぼけることがない。このような空間の領域を近軸域,その中にある光線を近軸光線という。近軸光線による結像の理論を以下に述べる。…

※「近軸域」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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