प्रदीपन में, \(\frac{\text { Mean spherical candle power of a source }}{\text { Mean hemi-spherical candle power of the same source }}\) = ?

1
न्यूनीकरण गुणक
2
अनुरक्षण गुणक
3
अवशोषण गुणक
4
उपयोजन गुणक

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