define the term focus and focal length of a concave mirror draw digram to illustrate your answer
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The Focus of a concave mirror it is a point on the principal axis through which the light rays that are incident parallel to the principal axis, pass once the light is reflected from the mirror.
the Focal length of a concave mirror it is the distance of the focus from the pole of the concave mirror
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The distance between the pole of the concave mirror and the focus is known as the focal length of the concave mirror. ... A ray of light AB which is travelling parallel to the principal axis PC is incident on a concave mirror at B. After reflection, it goes through the focus F. P is the pole of the mirror.
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