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一、探究光的反射规律例1(2015年1月枣庄五校联考题)小明在探究“光反射的规律”时将一块平面镜放在水平桌面上,再把一张纸板放置在平面镜上。(1)小明让一束光贴着纸板斜射到O点(如图甲),要使入射光线和其反射光线的径迹同时在纸板上出现,纸板与平面镜的位置关系是(选填“一定垂直”“一定不垂直”或“可以垂直也可以不垂直”)。
First, to explore the law of reflection of light Example 1 (January 2015 Zaozhuang five school exam questions) Xiaoming in exploring “light reflection law ” will be a piece of plane mirror on the horizontal table, and then put a piece of cardboard in the plane mirror . (1) Xiaoming let a beam of light stick to the O point of the cardboard (Figure A), so that the incident light and its reflection of light trails appear on the cardboard at the same time, cardboard and the relationship between the plane mirror is (optional Certain vertical “” must not be vertical “or ” may or may not be vertical ").