what is freshnel and fraunhoffer diffraction ? where it is useful ?

Freshnal difraction: both the point source and screen is relatively close to the obstacle then forms  difraction pattern. this situation is described as  near field diffraction or  freshnal diffraction.

Fraunhoffer diffraction: IF the source, obstacle and screen are far enough away  that all lines from source to the obstacle can conside parllal,this pnenomenon is called fraunhoffer diffraction.

We will use fraunhofffer diffrction is usually simpler to analyze.

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the diffraction in which the source obstacle and the screen are of enough distance. in this diffraction the waves are considered parallel. this is known as fraunhoffer or field diffraction

 

fraun hoffer diffraction is known as a abstacle and source and the screen are the close ly placed..and it is also known as the near field differaction...

frehnal diffraction: it is known as  the obsatacle and source and screen are to be far away to the each other and it is also known as  the far field differacton....

The diffraction in which the source obstacle and the screen are of enough distance. in this diffraction the waves are considered parallel. this is known as fraunhoffer or field diffraction.

in freshnel difraction source and obstacle and the screen are close to each other this is also called near fieald difraction in fraunhoffer diffraction source and obstacle and screen are far apart to each other this also called farfield diffraction

In freshnel diffraction source and obstacle and the screen are close to each other this is called near field diffraction in fraunhoffer diffraction source and obstacle and screen are far apart to each other this also called farfield diffraction.

In freshnel diffraction source and obstacle and the screen are close to each other this is called near field diffraction in fraunhoffer diffraction source and obstacle and screen are far apart to each other this also called farfield diffraction.