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Chapter 8:
Diffraction Limit, Resolution, and Modulation Transfer Function
Based on the wave hypothesis of light, there is an effect termed diffraction. Simply stated, when a plane wave-front passes an edge, there is a lateral spreading effect, termed diffraction, schematically depicted in Fig. 8.1. This diffraction effect is the reason that an object point cannot be imaged as a point, even if it can be predicted as such by geometric ray tracing.
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