Define principal focus.
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It is a point on the axis of a lens or a mirror which converts the parallel lights and diverse after reflection ..
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Principal focus (F): It is a point on the principal Axis where all light rays which are parallel to principal axis either converge or appear to diverge from, after refraction. मैं आशा करता हूँ कि आपकों इससे मदद् मिलेगी।
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