what is principal focus and focus length 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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Principle focus is the the line passing through the focus and centre of curvature to the pole of the mirror,and the focal length is the distance between the focus and the pole of the mirror.
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