Do you have the explanation about how diffraction grating lenses work?

This message has been edited. Last edited by: DorianGreyed,

Well,.............

all I can say for now is that it has something to do with cylindrical eyesight problem through which the rays are converged at a particular angle rather than the usual one.

Okies,
Pin~Jinx / anarchist

This answer was given to the same question at AskCOSI:

"Diffraction gratings produce spectra because the slits that the light passes through are very close together, on the order of 20,000 per inch. These slits are usually on the same size as the wavelength of light passing through it. When light passes through the tiny slits, interference of the individual wavelengths occurs as the light bends around the edges of each slit. Different colors of light bend different amounts. The result is a spectrum of colors is produced when white light is sent through the grating. Red wavelengths are bent more than blue wavelengths in diffraction so you will see a spectrum that is the reverse of prism refraction (where blue wavelengths are refracted more than red). You can also use diffraction gratings to see the spectra of individual elements (as in gas excitation tubes) if the light of the individual elements are sent through the diffraction grating."

THanks fuse for the site!

I've not put it into practice yet but using a shard from a broken audio CD may make a pretty good. grating to play with.. If you ever look at the bright rainbow when holding the CD at a shallow angle. slowly moveing to even shallower angles you can see 2nd and 3rd order effects too..