What is the distance of the principal focus F from the pole P of the spherical mirror called?
AImage distance (v)
BFocal length (f)
CObject distance (u)
DVirtual distance
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ഗോളീയ ലെൻസിന്റെ ജ്യാമിതീയ കേന്ദ്രം അറിയപ്പെടുന്നത്: