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Q.

Principal ____ of a concave mirror is a point on the principal axis of the mirror at which the light rays coming from the principal axis, after reflection, actually meet.


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Detailed Solution

Principal focus of a concave mirror is a point on the principal axis of the mirror at which the light rays coming from the principal axis, after reflection, actually meet.
The light rays parallel to the principal axis of a concave mirror meet at a specific point on the principal axis after undergoing reflection. This point of convergence is called the principal focus of a concave mirror.
 
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