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关于用插针法证明光的反射定律的实验,在陈许合编初中物理学课本下册底第26面底作法第一点说道:“使玻璃的涂黑面与直线MN相合。”这意思就是说反射的交界面是涂黑的一面。我在预做这个实验时就有些怀疑,反射面为什么会是涂黑的一面?为什幺不是不涂黑的一面呢?我们都知道光的反射作用发生于两种不同媒质的交界面,那么两面应该均有反射作用,何以就断定只是涂黑面有反射作用呢?
As for the experiment on how to prove the reflection law of light by the pin method, the first point in the bottom of the text under the bottom of the textbook of physics of junior high school written by Chen Xuhe states: “Make the black surface of glass coincide with the line MN.” This means that Reflected interface is black side. When I did this experiment, I was somewhat skeptical of why the reflective surface was blacked out and why it was not blacked out. We all know that the reflection of light occurs at the interface between two different media, so Both sides should have a reflective effect, why only to determine the role of black surface reflex?