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Half Acceptance angle : ウィキペディア英語版 | Half Acceptance angle
A ray of light traveling in an optical fiber must be incident at the critical angle on the internal surface of the fiber in order to have total internal reflection. When the ray is fed into the fiber, the refractive index of the traveling medium is different from what it is inside the optical fiber. So the angle of incidence should be such that after refraction, when the ray of light reaches the cladding, it does so at the critical angle.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Half Acceptance angle」の詳細全文を読む
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