The core of a fiber optic cable is made of lead-glass (PbO-SiO2) with refractive

Question

The core of a fiber optic cable is made of lead-glass (PbO-SiO2) with refractive index n=1.95. The cladding material is soda-glass (Na-SiO2) with refractive index n=1.38. The refractive indices of these materials do not depend on photon wavelength (?). Use Snell

The core of a fiber optic cable is made of lead-glass (PbO-SiO2) with refractive index n=1.95. The cladding material is soda-glass (Na-SiO2) with refractive index n=1.38. The refractive indices of these materials do not depend on photon wavelength (?). Use Snell??s Law for the refraction of light to calculate the angle necessary to achieve total internal reflection. This angle is termed the critical angle.

Explanation / Answer

Apply sin(ic) = n2/n1

sin(ic) = 1.38/1.95

ic = 45.0o

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