How are wavelength and frequency of light measured experimentally?

[namanjain]

How are the wavelength and frequency of light measured experimentally, are the equal to frequency of their consistent electric and magnetic field motion's frequency...

 

[janhaa]

For example;
standard spectrometer and diffraction grating experiment will allow you to measure the wavelength of light...

http://en.wikipedia.org/wiki/Spectrometer

http://en.wikipedia.org/wiki/Diffraction_grating