# How long are infrared waves compared with waves of visible light?

Infra red ranges from the upper end of the wavelength of visible light up to $1400$ times that.
The wavelength of visible light ranges from $400$nm up to $700$nm.
The wavelength of infra red ranges from $700$nm ($7 \times {10}^{-} 7$m) all of the way up to $1$mm ($1 \times {10}^{-} 3$m).