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principal axis of spherical lens |
Answer» <p>PrincipalFocus. Theprincipalfocus of alensis a point on itsprincipal axiswherein the rays of light parallel to it and after passing through it converge (for a convexlens) or appear to diverge (for a concavelens). Theprincipalfocus of alensis denoted by the letter F.</p> | |