TopTechnical DictionaryFocal length

Focal length

Focal length is a distance between an optical focus of an optical system and a cardinal point of the optical system in millimeters and is defined as the lens system ability to focus light. The smaller the focal length, the more the light beams are focused by the optical system.

 

Fig. 1:

 

P - optical axis

O - cardinal point of lens or lens system


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