So how exactly do you get a cat interested in a "beam of invisible light?"
And how do you know when your batteries are dead?
The beam of light is invisible to the human eye, but the spot where it makes contact with an opaque surface shows the light.
Well that would be visible light then, wouldn't it? Or are you saying that sunlight is also invisible light until it makes contact with something?
ummmmm
I never said the light wasn't visible.
I said the beam wasn't.

You can get green laser pointers, where the beam is visible. At night you can see the beam from a flashlight.
Other lights can be seen as well, though the less focused they are, then the less visible any beam will be, though you can usually see the haloing effect all around the light in its imidiate proximity.
But anyway...
Nothing serious to speak about here, so regardless of whether I'm right or wrong, I was mainly just pointing out that it was obviously (to me anyway) talking about a laser pointer.
