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When light passes from air into glass, or from air into water, it usually changes direction. We say the glass or the water refracts the light. That is why a straw in a drink looks broken at the surface, and why a lens can make things look bigger or bring a picture to a point. Physics teachers, opticians, and camera people use this verb; in everyday talk people more often just say the light “bends.” Though actually, students mix this up with reflect almost every time: if light bounces off a mirror, that is reflecting; if it goes through and changes path, that is refracting. The old Latin picture is “break again” — the ray is broken off its old straight line.
折射（光穿過水／玻璃時轉向；不是鏡子那種「反射」）
組成From Latin refrāctum / refrāctus, the past form of refringō: re- (again) + frangō (to break).
同家族的字
- refractionthe noun for this same bending of light
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
refractverb
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natural-sciencesphysical-sciencesphysicsOf a medium, substance, object, etc.: to deflect the course of (light rays), esp. when they enter the medium, etc., at an oblique angle; to cause refraction of (light, other electromagnetic radiation, or sound or other wave phenomena).
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To mediate; to alter; to distort.
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engineeringnatural-sciencesopticsTo cause (light) to change direction as a result of entering a different medium.
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medicineophthalmologysciencesTo measure, and often also to correct with lenses, the refractive error of (an eye) or the eyes of (a person).
- A prism can refract light.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。