A Complete Collection of 100000 Whys
Fav十万个为什么
为什么路灯下影子会变短？
简单的摘要：路灯下影子会变短的原因主要是光源位置、物体与光源的距离以及光线入射角度的变化。
1、光源位置：路灯作为光源，位于一定高度。当物体靠近路灯时，物体与光源之间的相对位置发生变化，导致影子长度改变。
2、物体与光源的距离：随着物体逐渐靠近光源，物体与地面形成的影子会因距离缩短而变短。这是因为光线从光源到物体的路径变短，投影在地面上的影子也随之减小。
3、光线入射角度的变化：当物体靠近路灯时，光线入射角度逐渐变大，趋向于垂直照射。这种垂直或接近日光直射的角度使得影子变得较短，甚至几乎没有影子。
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