...ed ray )，入射线与法线间的夹角为入射角(angle of incidence)，用i表示； 反射线 与法线间的夹角为反射角(angle of reflection)，用r表示。
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N the angle that a beam of reflected radiation makes with the normal to a surface at the point of reflection 反射角
The elusive Planet X is, however, shrouded by a dust cloud that bounces sunlight back to the Sun, except for those rare moments when the angle of reflection is just right.
行星X行踪飘忽，躲躲藏藏，被尘埃云雾包裹着，除了反射角度刚刚好的稀有时刻外，都将阳光反射回了太阳。
The Angle of incidence equals the Angle of reflection.
入射角等于反射角。
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