TV Remote Seen by a Camera
Camera often shows blinking light invisible to eyes.
Teaching & key ideas
What you do: Point remote at camera and press buttons.
What students see: Camera often shows blinking light invisible to eyes.
Why it works: Camera sensor can detect near-infrared wavelengths our eyes cannot.
Question to ask: How can the camera see light we can't?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: How can the camera see light we can't?