what is frenal distance?
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An Aperture of size illuminated by a parallel beam sends diffracted beam (the central maxima) in angular width approximately . Travelling a distance , it aquires the width z λ / a due to diffraction. The distance at which this width equals the size of the aperture is called the fresnel distanc
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An Aperture of size illuminated by a parallel beam sends diffracted beam (the central maxima) in angular width approximately . Travelling a distance , it aquires the width z λ / a due to diffraction. The distance at which this width equals the size of the aperture is called the fresnel distance
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