Question

what is frenal distance ​

Answer 1

Answer:

Heya mate......

Fresnel distance describes the distanceat which spread due to diffraction becomes comparable to the width of the slit or not. This is the boundary of ray optics and wave optics. For distances << zf : Spreading due to diffraction is smaller compared to size of the beam then the ray optics is valid.

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Answer 2

Explanation:

Fresnel distance describes the distance at which spread due to diffraction becomes comparable to the width of the slit or not. This is the boundary of ray optics and wave optics.

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