>>4322819thing is laser not being visible works perfectly fine with the standard physics model.pic related, laser travels in a direct line, doesnt meet the eyeball, and thus it isnt seen. it then hits the reflectlive surface (grey) and the light gets reflected in every direction of which one meets the eye, and then is visible. point the laser directly onto your eye (which i did as a kid with my laserpointer) and you will see the laser too