define the focal length an draw its diagram
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THE DISTANCE BETWEEN THE CENTRE OF A LENS OR CURVED MIRROR AND ITS FOCUS.
DIAGRAM IS ABOVE!
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Focus of a concave mirror: The focus of a concave mirror is a point on the principal axis through which the light rays incident parallel to principal axis, pass after reflection from the mirror. Focal length of a concave mirror: The distance of the focus from the pole of the concave mirror is called its focal length.
Focal length of a concave mirror it is the distance of the focus from the pole of the concave mirror
diagram in attachment
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