Have you ever wondered why you can't see the light signals coming out of the little bulb on your remote control? The bulb actually emits a type of invisible light.
Infrared Radiation (IR) is electromagnetic radiation with a longer wavelength than light that is visible to the average human eye. This is why you can't see the light signals coming out of your remote control.
The infrared spectrum extends from a wavelength of 700 nm (nanometres) to 1 millimetre. 700 nm is the edge of red in the visible spectrum. To give you a better idea of what is included in that range, 1,000 nanometres make a micrometre or micron and 1,000 microns make a millimetre.
The IR signal emitted by remote controls is often around 940 nm in wavelength.
Since it is quite similar to visible light, it is able to be bounced off mirrors or walls. You can actually aim your remote control at the wall behind you and bounce the signal off it to your device.
We hope this answered your question.?
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