Red light
Violet light
Infrared light
Ultraviolet light
- A part of the EM (electromagnetic) spectrum and has wavelengths ranging from about 700 nanometers (nm) to 1 millimetre (mm).
- It has longer wavelengths than visible light.
- Infrared cameras and telescopes or night-vision goggles etc, use infrared waves to sense or measure the heat radiated by the object.
- Infrared waves, also known as infrared light, are a type of electromagnetic wave. Night vision goggles use thermal imaging technology to capture that infrared light. This way, you can see an image of what’s going on in the dark.
- Every day, people are exposed to infrared waves; the human eye cannot see them, but humans can detect them as heat.
- Infrared energy radiated from the hot objects can be detected and then converted into an electronic signal to produce a visual image by cameras telescopes.
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