By Robert F. Fischer, Bijana Tadic
This vintage source offers a transparent, well-illustrated advent to the necessities of optical design-from easy ideas to state-of-the-art layout equipment.
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Extra resources for Optical System Design, 1st Edition
However, as the angles of incidence increase, the difference between the real and the paraxial descending angles increases quite significantly. This is where aberrations come from. 6186 Difference (degrees) Diffraction, Aberrations, and Image Quality 41 incidence as small as possible on the various surfaces within your system. What Is Diffraction? Diffraction is a phenomena or effect resulting from the interaction of light (which of course is electromagnetic radiation) with the sharp limiting edge or aperture of an optical system.
Diffraction is a phenomena or effect resulting from the interaction of light (which of course is electromagnetic radiation) with the sharp limiting edge or aperture of an optical system. While we could very easily fill the next few pages with integral signs and Bessel functions, it is not the intention of the authors to provide this level of detail. Rather, the following explanation is easy to follow and should provide a sufficient level of understanding of the causes of diffraction and resultant observable effects.
There is a fundamental law of physics, which says that the wavefronts must be continuous at the interface between the media. Considering the velocity reduction along with the wavefront continuity requirement, we can see how the entire wavefront is rotated around in a clockwise direction as it proceeds into the denser medium. Interestingly, you can use this construction to rederive Snell’s law!