What is the difference between first and second principal focus of a spherical mirror ?
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principal focus,it turns out science that if a beam of light, all parallel to principal axis of lense, fall on the lense, they either all converge to a point in its principal axis.
focus,when you beam of light appears on particular point continously, in it the focus
focus,when you beam of light appears on particular point continously, in it the focus
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