Use the infrared remote control to turn the television on and off. How far to the side of the television can you point the remote control and still have it work?
Go into a dark room and point the remote control at your eye. Press the button that turns the television on and off. Can you see the light coming from the bulb in the remote?
Point the remote control at a digital camera and press a button on the remote. Notice that you can see light coming from the bulb on the screen of the camera, but you can’t see it with your naked eye.
Note: You may not see anything if your camera has an infrared light filter. If you are using a mobile device with two cameras and don't see a light, try the front-facing camera, which is less likely to have a filter.
Place a clear piece of glass or plastic between the remote and the camera. Use the camera to look at the remote while you press the buttons. Does the glass block the camera from detecting the light?
Point the remote toward a mirror and look at the image through the camera while you press the buttons. Does the light from the remote bounce off the mirror into the camera?
Try to change channels on the television while pointing the remote control through a single layer of material from a black plastic trash bag. Did it work? Try the same thing through two or more layers, and then do the same experiment with the digital camera.
Is there an image in the digital camera when you push buttons on the plastic-covered remote?