Diffraction

Physical scientists in the early 19 th century was surprised by the behavior of light that turned around the corner.

When light from a source point on the edge that produces a shadow, the shadow edge is never perfectly sharp. At the edge we found a pattern of light and dark alternately. The reason for these events is due difaksi incident, which happened interference effects resulting from the many waves of light.

Diffraction of light deflection is the event because of obstructions, such as lattice gap. Diffraction can also be described as "bending of light around an obstacle"

Fresnel diffraction
If a light and screen seumber relatively close to the grating diffraction pattern.

Fraunhofer diffraction
If the source, the lattice and the screen far enough away, so all the lines from the source to the lattice can be considered parallel.

When a light with certain wavelengths in the pass on a crack, then it will have the light diffraction and interference.

In a diffraction grating, each beam diffraction caused cracks or face a new wave, then the file is mutually interfere with each other to produce the pattern of dark and light end

Note: the interference occurs only if there are two or more waves.



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