lecture34 - Diffraction and Limits of Resolution

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Diffraction and Limits of Resolution
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Diffraction through a  circular  aperture of diameter D Intensity Diameter D Image on Screen θ = 1.22 λ /D Because of diffraction, images formed by “perfect” optics are fuzzy.
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For a circular aperture: The angle  θ  from the centre to first dark ring (“angular radius” of central  spot) is:                                θ = 1.22 λ/D  radians This is useful in calculating the limiting resolution of optical instruments  (microscopes or telescopes). The central spot is sometimes called the Airy disk
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Quiz: What would the central spot look like if white light were  used for the beam? A) Blue in the centre and red around the edge B) Red in the centre and blue around the edge C) White in the centre and red around the edge
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Example:  Sodium light (589nm) is used to view objects under a microscope.  If the aperture of the objective has a 
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This note was uploaded on 10/14/2011 for the course ENGINEER CHEM ENG 3 taught by Professor Ghosh during the Spring '11 term at McMaster University.

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lecture34 - Diffraction and Limits of Resolution

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