Q. A multi-mode optical fiber with a large core diameter has a core refractive index ๐1 = 1.5 and cladding refractive index ๐2 = 1.4142. The maximum value of ๐๐ด (in degrees) for which the incident light from air will be guided in the optical fiber is ยฑย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย .
Ans: 29-31
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