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british
focal ratio
noun
Optics
,
Photography
.
f-number
.
Origin of focal ratio
First recorded in 1925–30
Words nearby focal ratio
focal infection
,
focal length
,
focal necrosis
,
focal plane
,
focal point
,
focal ratio
,
focal reaction
,
focal segmental glomerulosclerosis
,
focal seizure
,
focal-plane shutter
,
focalize
British Dictionary definitions for
focal ratio
focal ratio
noun
photog
another name for
f-number