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word of the day
focal ratio
focal ratio - Dictionary definition and meaning for word
focal ratio
Definition
(noun) the ratio of the focal length to the diameter of a (camera) lens system
Synonyms
:
f number
,
speed
,
stop number
Word used in video below:
text: And if the ratio of the electromagnetic force
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5 Great English Vocabulary Books we Recommend!
Oxford Picture Dictionary
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English Vocabulary in Use Advanced with CD-ROM: Vocabulary Reference and Practice 2nd Edition
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