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# What is Diffraction? Definition and its types and comparison?

## Diffraction

When the light falls on the obstacle whose size is comparable with the wavelength of light then the light bends around the obstacle and enters the geometrical shadow. This bending of light is diffraction.

We can define Diffraction as bending of light when it passes around the edge of an object. But the proportion of bending depends on the relative size of the wavelength of light to the size of the opening. So If the opening is greater than the wavelength of light, the bending will be almost negligible. Whereas if the two are closer in size or equal, the amount of bending is noticeable and can be easily seen with the naked eye.

## Types of Diffraction

There are two types of diffraction

1.     Fresnel Diffraction: Fresnel diffraction occurs when light from a point source meets an obstacle. The waves are spherical and the pattern observed is a fringed image of the object.

2.     Fraunhofer Diffraction: Fraunhofer diffraction occurs with plane wave-fronts with the object situated at infinity. The pattern observed  is a fringed image of the source and in a particular direction.

## Comparison

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