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Describes how transparent objects may only retard light without diffracting it
Spatial deteil vs acceptance angle
Acceptance angle of objective must be wide enough to collect at least first order diffracted rays
See back focal plane using telescope
The rear focal plane of the objective can be observed using a telescope insert into the eyepiece tube.
Diffraction pattern in the transform plane
Demonstration of diffraction patterns in a test object - (Diatom test slide).
Condenser N.A. must at least match that of the objective to realize full resolution.
Complex frequency-based information can be decomposed into combinations of simple waveforms.
Object detail vs. acceptance angle
The finer the spatial detail in an object the wider the diffraction angle - easily seen with a laser pointer and a fine grating.