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abhinavjeet
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why in fraunhoffer diffraction a lens is used
Fraunhoffer diffraction is a type of diffraction that occurs when a wave passes through an aperture or slit and produces a diffraction pattern on a screen. It is named after German physicist Joseph von Fraunhofer, who first studied this phenomenon in the early 1800s.
Lenses play a crucial role in Fraunhoffer diffraction by converging the light waves to a point on the screen, creating a focused diffraction pattern. Without lenses, the diffraction pattern would be less defined and spread out.
The size of the aperture directly affects the diffraction pattern produced. A smaller aperture will result in a wider diffraction pattern, while a larger aperture will result in a narrower pattern. This is because a smaller aperture diffracts the light waves more, causing them to spread out more on the screen.
The main difference between Fraunhoffer diffraction and Fresnel diffraction is the distance between the aperture and the screen. In Fraunhoffer diffraction, the distance is large and the light waves are considered to be parallel. In Fresnel diffraction, the distance is small and the light waves are not parallel, resulting in a more complex diffraction pattern.
Fraunhoffer diffraction has many practical applications, such as in telescope and microscope design, laser technology, and spectroscopy. It is also used in various industries for quality control and measurement, such as in the production of computer chips and optical fibers.