The core of an optical fiber has a
∙ a. Lower refracted index than air
∙ b. Lower refractive index than the cladding
∙ c. Higher refractive index than the cladding
∙ d. Similar refractive index with the cladding
∙ a. Lower refracted index than air
∙ b. Lower refractive index than the cladding
∙ c. Higher refractive index than the cladding
∙ d. Similar refractive index with the cladding