Recently I made this video. It can be seen and heard that the remote control (MTLogic) of our TV doesn't work when I place an object between it and the TV. This is the remote control:
It's obvious the signal doesn't reach the TV when the object is present. How can this be explained? I tried to do this at every angle (at the same distance though), horizontally as well as vertically, the device always directed towards the TV.
The object I placed first was a metal bottle. With a plastic bottle, the effect didn't occur just as it didn't with a glass bottle. Or aluminum foil, or a piece of paper. Toilet paper was the exception to the rule.
So the fact that the (hollow) object is made from metal is clearly of importance.
-Is the signal simply blocked (even though the object is made out of metal)?
-Does the object cause a disturbance?
-Is the signal reflected?
What's the answer? I guess the IR radiation is simply absorbed or reflected by the metal. Which might be the case for the other materials too?
Is it possible to do an experiment to show how much the IR beam diverges? E.g. by measuring the distance for which the remote control works again (in combination with the diameter of the object placed in the way)? What would be he associated formula?
Just for fun (thanx to a comment), I made a little video of the IR radiation coming from my remote control. I don't understand why it's white though. But that's a technical question, not suited for this site.