Define the relative refractive index difference for an optical fiber and show how it
May be related to the numerical aperture. A step index fiber with a large core diameter compared with the wavelength of the transmitted light has an acceptance angle in air of 22° and a relative refractive index difference of 3%. Estimate the numerical aperture and the critical angle at the core–cladding interface for the fiber.
"\\Delta =1-\\frac{n_2}{n_1},"
"n_2=0.97n_1,"
"n_2=1,"
"n_1=1.03,"
"NA=\\sqrt{n_1^2-n_2^2}=0.25,"
"\\beta=\\arcsin\\frac {n_1}{\\sin\\alpha}=25\u00b0."
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