define focal length?????? urgentttttttt
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The distance between focus and pole of the spherical mirror is known as focal length...
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Refer the give image.
The rays coming from the sun parallel to the principal axis of concave mirror converge to a point. This point is called Focus or focal point (F) of the concave mirror. Measure the distance the distance of this spot from the pole of the mirror. This distance is called as Focal length (f)
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