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n 1 surrounded by a medium of lower refractive index n 2 . The light guidance in thestructure takes place due to successive total internal reflections at the interface of the media n 1 and n 2 as shown inthe figure. All rays with the angle of incidence i less than a particular value i m are confined in the medium ofrefractive index n 1 . The numerical aperture (NA) of the structure is defined as sin i m .
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Light guidance in an optical fiber can be understood by considering a structure comprising of thin solid glasscylinder of refractive index © examsnet.com
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