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Chapter 6 F
ind the correct Focal Length
第六节 寻找正确焦距
FIRST STEP:
To know what the focal length is
第一步:要知道焦距是多少
Definition:
The focal length of an optical system is a measure of how strongly the system converges or diverges light. For an
optical system in air, it is the distance over which initially collimated (parallel) rays are brought to a focus. A system with a
shorter focal length has greater optical power than one with a long focal length; that is, it bends the rays more sharply,
bringing them to a focus in a shorter distance.
Check by visiting:
https://en.wikipedia.org/wiki/Focal_length
定义:光学系统的焦距是对系统会聚或发散光的强度的度量。 对于空气中的光学系统,它是最初经过准直(平
行)的光线聚焦的距离。 焦距较短的系统比焦距较长的系统具有更大的光焦度。也就是说,它使光线弯曲得更厉害,
使它们在较短距离内聚焦。
请访问以下网址进行检查:
https://en.wikipedia.org/wiki/Focal_length