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The quick answer to your question is this : TV remotes typically operate in the infra red (IR) and our eyes are not sensitive to IR but camera sensors are. I guess you are intrigued by the fact that when you operate a TV remote facing a camera, you can typically see a red light on the IR diode of the remote in the camera screen, whereas with naked eyes you ...

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A common wavelength for an IR emitter for a remote control is 980 nm. The human eye can only detect wavelengths up to about 725 nm efficiently, so we don't see the beam from the IR remote. (In the case of an 850 nm IR signal you may see some residual emission within the human sensitivity range). Cameras, on the other hand, typically are made with silicon ...

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I think, if you plot $B_{\lambda}$ in equation (2) with respect to $\lambda$ you get a distribution. As in https://en.wikipedia.org/wiki/Black-body_radiation#/media/File:Black_body.svg So, if you want to find the temperature from wavelength you need the find the point where the intensity peaks. That is to say you need to find the maximum point of ...

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