Question

how cum the camera sees infrared light

Answer 1

Why does any camera see any form of EM radiation, of which visible light and infrared light are a type? (Or X-rays, or gamma rays or ultra-violet or ...)

Because they have sensors that detect photons that have that frequency. It could be a chemical plate in which the chemicals react to infrared light. It could be a chip that is activated electronically when a photon of infrared radiation hits it.

Answer 2

ohh thanks a lot

Answer 3

what u r talking of is a digital camera.
Optical devices have a characteristic spectral response, which tells us the behavior of the device at different frequencies. An optical system behaves differently to different frequencies. What factor decides this????? It depends on the sensing material used in the camera which is silicon. A silicon sensor can sense light of wavelength upto ~ 1.2 microns, which falls in the IR region. One more thing, a camera uses glass as the focusing element, which passes light of wavelength upto 1.3 microns........ thus a camera can sense IR rays.

Answer 4

thanks