wavelength and diffraction

Diffraction is one of the characteristics of waves. It can be explained by Huygen's Principle. The original principle is rather mathematical. A simple explanation is given below.
Suppose a plane wavefront is incident onto an obstacle with a small opening, Huygen's principle states that every point on the wavefront can be regarded as a point source, each of which emits its own spherical waves with the same wavelength as the incident plane wavefront.
Hence, for an infinite number of point sources along a line (the plane wavefront), any transverse motion cancels. But for a finite length, the sources near the edge have nothing to cancel the transverse component, so there is propagation both forward and outward, toward the region that is shielded. The wavefront then looks like it is bending, since it can now propagate behind the obstacle.
It is then not difficult to see that the longer the wavelength, the the more the "transverse component" (i.e. the wave curvature) will be. This indicates that the wave diffracts more.

v= f 入

frequency 係 constant

v愈高
入愈高

But n Lambda = d sin Theta Is The Formula Of Double Slit Interference,

Its Also Can Be Prove The Diffraction?

Lambda Is The Wavelength(Means Color),

Why Color Can Be Affect The Effect Of Diffraction?

n入 = dsin@
波長，入愈大，@便愈大，故diffraction就較明顯了