thankyou aasif sir for explaining my query related to dispersion.i understood that medium will behave differently for different wavelengths or the refractive index changes with wavelenghts.That means at the output we will get spreading of the signal as different wavelengths will reach at different times resulting loss of signal.
So please explain this if i am correct in saying this.also please explain the various techniques by which we can reduce this.
with regards.