Light spectrum

I want to kno what is tha wavelength of black light?
Is there is something called black light if yes then how and if no then what is it?

Re : Light spectrum

400 to 700 nanometers.

Re : Light spectrum

First of all u must know that black is considered as a colour scientifically.
i dont know the reason if u know please tell me.

Re : Light spectrum

Black light is similar to white light except that it is just beyond what the human eyes can see.The wavelengths r shorter and it exists beyond the visible violet light, hence the name ultraviolet.