What is the definition of principal focus?
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principle focus is a point on the axis of the mirror or lens to which the parallel lines are converge and from which they appear to diverge after reflection and refraction...
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PRINCIPAL FOCUS OS THE POINT ON THE AXIS OF A LENS OR MIRROR TO WHICH PARALLEL RAYS OF LIGHT CONVERGE OR FROM WHICH THEY APPEAR TO DIVERGE AFTER REFLECTION OR REFRACTION...
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HERE IS YOUR ANSWER...
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PRINCIPAL FOCUS OS THE POINT ON THE AXIS OF A LENS OR MIRROR TO WHICH PARALLEL RAYS OF LIGHT CONVERGE OR FROM WHICH THEY APPEAR TO DIVERGE AFTER REFLECTION OR REFRACTION...
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PLEASE MARK ME AS THE BRAINLIEST....
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