Define the principal focus of a concave mirror .
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Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.
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Light ray that are parallel to the principal axis of a concave mirror converge at a specific point on its principle axis after reflecting from the mirror. this point is known principal focus of the concave mirror..
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