what is principle focus
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principal focus, focus 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.
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HEY DEAR .....!!
principal focus, focus 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.
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HOPE IT'S HELP U
principal focus, focus 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.
@@@@@@@@@@@@@@@@@@@@
HOPE IT'S HELP U
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