English

Definition of focal length noun from the Oxford Advanced Learner's Dictionary

 

focal length

 noun
noun
BrE BrE//ˌfəʊkl ˈleŋθ//
 
; NAmE NAmE//ˌfoʊkl ˈleŋθ//
 
(physics)
 
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the distance between the centre of a mirror or a lens and its focus
See the Oxford Advanced American Dictionary entry: focal length