Fresnel diffraction and Fraunhofer diffraction are two types of diffraction that occur when light waves encounter an obstacle or aperture.
The main difference between Fresnel diffraction and Fraunhofer diffraction is the distance between the diffracting object and the screen on which the diffraction pattern is observed.
In Fresnel diffraction, the diffracting object and the screen are close enough that the curvature of the wavefronts cannot be ignored. This means that the wavefronts are not parallel, and the diffraction pattern is affected by the shape of the object. Fresnel diffraction is typically observed when the diffracting object is close to the screen, such as in the case of a lens or a curved mirror.
In Fraunhofer diffraction, the diffracting object and the screen are far enough apart that the wavefronts can be considered parallel. This means that the diffraction pattern is determined only by the shape of the object and not by its distance from the screen. Fraunhofer diffraction is typically observed when the diffracting object is far from the screen, such as in the case of a narrow slit or a diffraction grating.
In summary, the main difference between Fresnel diffraction and Fraunhofer diffraction is the distance between the diffracting object and the screen on which the diffraction pattern is observed. Fresnel diffraction occurs when the object and screen are close, while Fraunhofer diffraction occurs when they are far apart.
Diffraction is of two types: Fresnel Diffraction- This type of diffraction which occurs when the light source lies at a finite distance from the slit. Fraunhofer Diffraction- This type of diffraction which occurs when a plane wavefront is incident on the slit and the wavefront emerging from the slit is also plane.
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Fresnel diffraction and Fraunhofer diffraction are two types of diffraction that occur when light waves encounter an obstacle or aperture.
The main difference between Fresnel diffraction and Fraunhofer diffraction is the distance between the diffracting object and the screen on which the diffraction pattern is observed.
In Fresnel diffraction, the diffracting object and the screen are close enough that the curvature of the wavefronts cannot be ignored. This means that the wavefronts are not parallel, and the diffraction pattern is affected by the shape of the object. Fresnel diffraction is typically observed when the diffracting object is close to the screen, such as in the case of a lens or a curved mirror.
In Fraunhofer diffraction, the diffracting object and the screen are far enough apart that the wavefronts can be considered parallel. This means that the diffraction pattern is determined only by the shape of the object and not by its distance from the screen. Fraunhofer diffraction is typically observed when the diffracting object is far from the screen, such as in the case of a narrow slit or a diffraction grating.
In summary, the main difference between Fresnel diffraction and Fraunhofer diffraction is the distance between the diffracting object and the screen on which the diffraction pattern is observed. Fresnel diffraction occurs when the object and screen are close, while Fraunhofer diffraction occurs when they are far apart.
Answer:
Diffraction is of two types: Fresnel Diffraction- This type of diffraction which occurs when the light source lies at a finite distance from the slit. Fraunhofer Diffraction- This type of diffraction which occurs when a plane wavefront is incident on the slit and the wavefront emerging from the slit is also plane.
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