大家知道 ,光在空气中的光路无法直接看到。为了看到光的行进情况 ,在许多相关的演示装置中 ,都需将光源发出的光束紧贴着白色的屏 ,以便在屏上显示光路 ,但只要稍不注意 ,光线就不见了 ,操作起来极不方便。然而 ,光在烟雾中的光路是清晰可见的。为此 ,我们取制作投影片的硬薄 As we all know, the light path in the air cannot be seen directly. In order to see the progress of light, in many related demonstration devices, the light beam emitted by the light source needs to be tightly pressed against the white screen to display the light path on the screen. However, as long as care is not taken, the light disappears. Extremely inconvenient. However, the light path of light in the smoke is clearly visible. For this purpose, we take hard and thin slides