gd morning guys
explain principle focus?
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The principal focus is defined as the point where a beam parallel to the principal axis appears to diverge converges from a point on the principal axis after passing through the lens.
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Answer:
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 refraction or reflection.
i will also recommended a video lecture of Alakh Pandey from youtube channel physics wallah.
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