影子是一种常见的物理现象.当光线碰到不透明的物体时,就会产生影子.无论是在阳光下,还是在灯光下,影子与我们总是“形影不离”.但由于太阳和地球存在相对运动,所以不同的季节,不同的时刻,阳光的入射角度就不同,因此物体的影子也不同;而在灯光下,因为光在同一均匀介质中沿直线 Shadow is a common physical phenomenon. When light hits an opaque object, it produces shadows. The shadows are always inseparable from the sun and light, but because the sun and the earth are Movement, so different seasons, different times, the incident angle of sunlight is different, so the shadow of the object is also different; and in the light, because the light is in a straight line along the same homogeneous medium