The refractive index number is
∙ A. a number which compares the transparency of a material with that of air ∙ B. a number of assigned by the manufacturer to the fiber in question
∙ C. a number which determines the core diameter
∙ D. a term describing core elasticity
∙ A. a number which compares the transparency of a material with that of air ∙ B. a number of assigned by the manufacturer to the fiber in question
∙ C. a number which determines the core diameter
∙ D. a term describing core elasticity