# lecture34 - D i ffr a cti on a nd Li mi ts of Resol uti on...

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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 Because of diffraction, images formed by “perfect” optics are fuzzy.
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
Example: Sodium light (589nm) is used to view objects under a microscope. If the aperture of the objective has a diameter of 0.9 cm, a) find the limiting angle of resolution (max resolution) a) if the space between the object and the objective lens is filled with water (n=1.3), how is the resolution affected?

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## This note was uploaded on 03/16/2011 for the course PHYSIC 1e03 taught by Professor Dr.oak during the Spring '10 term at McMaster University.

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lecture34 - D i ffr a cti on a nd Li mi ts of Resol uti on...

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