永久链接提交的Muhammad iqbal shah (not verified)on Sat, 10/11/2018 - 16:48
When you place a torch in complete dark toom in upright position,turn it on and you see dust particles move as they were already moving in random direction but after few seconds they start moving in this direction of light.
Light can move dust particles
When you place a torch in complete dark toom in upright position,turn it on and you see dust particles move as they were already moving in random direction but after few seconds they start moving in this direction of light.