Remote detector

Marvin and Milo March 16

What you need

A remote control
A digital or phone camera, with a screen

Instructions

Look at the end of the remote while pressing its buttons – you shouldn’t see anything happening.

Now switch on the camera, point the remote at the camera screen and press the buttons.

The screen should show a flashing blue or purple light at the end of the remote. (If not, try a friend’s camera or remote.)

Results & explanation

Your remote sends signals using waves of infrared light. The light’s invisible to you, but not to your camera, which picks it up and converts it to a colour that you can see.