what is focal length??
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The distance between the centre of a mirror or a lens band its focus is called focal length .
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In mirror-
Focal lenght is half the length b/w the Centre of curvature(Centre of the spherical mirror) and pole of the mirror.
Or
Distance b/w focus and pole.
f=r/2
Focal lenght is half the length b/w the Centre of curvature(Centre of the spherical mirror) and pole of the mirror.
Or
Distance b/w focus and pole.
f=r/2
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