How Does a Camera See What You Can't?

What Is Light?

You know how you can see a red apple on the table? That is because light bounces off it and lands in your eyes. But there are other kinds of light that you cannot see. These are called invisible lights.

Cameras are like super-eyes. They can see these hidden lights too. When you point a special camera at a warm object, like a dog or a person, the camera sees the heat they give off. This is called infrared. It is like a secret language of warmth that only cameras and snakes understand.

How Do Cameras See Heat?

Inside a camera, there are tiny dots that count light particles. Normal cameras count visible light to make color pictures. Special cameras have extra sensors that catch the invisible heat waves. These heat waves travel through the air just like sound does.

When the sensor catches these waves, it turns them into colors on the screen. Usually, hot things look bright or red, and cold things look dark or blue. This helps us see in the dark because we do not need a lamp to see the heat of animals or cars.