Go to MSN Homeencarta®
Dictionary
Find
in
Dictionary
Thesaurus
Translations
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Click to move up the list of words
fob (2)
fob off
fob watch
FoC
focaccia
focal
focal distance
focal infection
focal length
focal-plane shutter
focal point
focal ratio
focalize
foci
focus
focus group
focused
Click to move down the list of words
Also available:

World English Dictionary
Dictionnaire Français

focal length
fo·cal length


noun 
Definition:
 
distance from lens to focal point: the distance from the center of a lens or the surface of a mirror to the point at which light passing through the lens or reflected from the mirror is focused.
Symbol  f
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
Advertisement
© 2009 Microsoft