Diffraction is a phenomenon which envolves the bending of waves around obstacles. It's generally guided by Huygen's Principle, which states: every point on a wave front acts as a source of tiny wavelets that move forward with the same speed as the wave; the wave front at a later instant is the surface that is tangent to the wavelets. If one considers diffraction through a slit then the properties of the system are wholly dependant on the ratio

Last modified: June 20, 1997