What is mean by focal length?
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The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light.
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Focal length: The distance between the vertex and focus is called focal length. (Or) The distance between pole and focus.
Vertex: The point where central axis touches the mirror.
Pole: The centre of the spherical mirror is called pole of the mirror.
Focus: The rays coming from distant object parallel to concave mirror will converge at a point called focus or focal point.
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