What parts of the light spectrum are invisable to the human eye?

im doing a project that deals with the light spectrum-- i would like to know if theres a way to see invisable light using emitting and detecting diodes to show that this certain light exists even tho its not visable to the human eye-- but can be detected using electronic circuits on a circuit board-- thanks|||Infrared emitters and sensors are what you need. They are available from a number of sources. Here is a page out of Digi-Key's catalog:





http://dkc3.digikey.com/PDF/T063/1881.pd…|||ultraviolet|||Most of it! Your eye only see from about 400 nanometers to 700 nanometers.|||light can be seen by humen being in the wavelength region 400nm to 700nm this region is also known as visible region of spectrum. Humen being cant see the color %26lt;400 %26amp; %26gt;700 nm





However if u hold a paper containing optical brightner u can see brilliance due to the reason that absorbed light at 360 nm is emitted in region at 420 nm|||infared and untraviolet|||Ultraviolet (too fast)


Infared (too slow)





contained within that would be things like x-rays and mircrowaves|||Gallium Nitride leds emitt invisible UV ultraviolet.|||infared and untraviolet








good luck|||Ultraviolet is too high a frequency for us to see. Higher still is X-rays, and the highest category is gamma radiation, which comes from radioactivity and nuclear power. Infrared is too low a frequency for us to see, and microwaves are lower still. The lowest category is radio waves.