define principal focus of a concave mirror?
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Explanation:
The principal focus of a concave mirror is a point on its principal axis to which all the light rays which are parallel will converge after reflection from the concave mirror.
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The principal focus of a concave mirror is a point on its principal axis to which all the light rays which are parallel will converge after reflection from the concave mirror. ... Hence it is the distance between points P and F.
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