Quick question - wavelength of light in air? (1 Viewer)

[Need_Help]

Hi, we are having to find the wavelength of a light ray refracted in the perspex block. Using Snell's law, i need the wavelength of light in air - what is it?.

Thanks

 

[helper]

It depends on the colour of light

 

[needFOOD]

uh, im pretty sure including all visible spectrum its between 4x10^-7 and 7x10^-7, could be wrong though, google it or look at a blackbody curve ^^