Re: Re: Re: EMC-programming request

> > What are fringes?
> > Tracey
>
> When a beam of laser light is split and recombined, or diffracted through a
> slit or grating, the coherency of the beam is disturbed (the wave fronts no
> longer match up perfectly). Where the wavefronts are in phase, the
> effective brightness is the sum of the two beams. Where the wavefronts are
> 180 degrees out of phase, they cancel each other out. Visually, this makes
> circles or lines what look like ocean waves (called fringes). Fringes can
> also be made in other ways. The spacing of the fringes is very precise and
> dependant on the wavelength of the laser light.
>
> (I hope that makes sense)