3 ms·
>...or a clear substrate to see through. Not always. An infrared filter could be used. Silicon sensors are quite sensitive to such wavelengths. So any shiny bl
by upofadown 8y ago
>...or a clear substrate to see through.
Not always. An infrared filter could be used. Silicon sensors are quite sensitive to such wavelengths. So any shiny black surface could be a camera. Sometimes in the right light the filter might look sort of reddish.
- michaelscott 8y agoIf this is the infrared sensor I think you mean, you can see these if you point a camera lens (like on your phone) at the surface; it will show up in red. You can try this with TV remotes that use infrared.