6. Figure 8 shows an optical fiber. The index of refraction of the inner core is 1.460, and the index of refraction of t

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6 Figure 8 Shows An Optical Fiber The Index Of Refraction Of The Inner Core Is 1 460 And The Index Of Refraction Of T 1 (54.98 KiB) Viewed 22 times

6. Figure 8 shows an optical fiber. The index of refraction of the inner core is 1.460, and the index of refraction of the outer cladding is 1.450. (a) What is the critical angle for the core-cladding interface? (b) For what range of angles in the core at the entrance of the fiber will the light be completely internally reflected at the core-cladding interface? (c) What range of incidence angles in air does this correspond to? (d) If light is totally internally reflected at the upper edge of the fiber, will it necessarily be totally internally reflected at the lower edge of the fiber (assuming edges are parallel)? Rajah 8 menunjukkan serat optik. Indeks biasan bagi teras dalaman adalah 1.460 dan Indeks biasan bagi lapisan luarnya adalah 1.460. (a) Apakah sudut kritikal bagi sempadan pemisah teras dalam dan pembalut? (b) Apakah julat bagi sudut dalam teras pada sempadan masuk serat optik dimana cahaya melakukan biasan dalaman sempurna yang total pada sempadan teras dalaman dan lapisan luaran? (eApakah pula julat sudut ruju biasan dalam udara yang berkaitan? (d) Jika sekiranya cahaya membuat biasan dalaman penuh pada sempadan atas benang optik, adakah mesti berlakunya biasan dalaman penoh pada sempadan dibahagian bawah (anggap sempadan adalah selari)? Air/udara n = 1.45 Cladding/pembalut Core/teras n = 1.46 Figure 8/Rajah 8