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The Hungry Heart
Algeria: Women at War
Describing how the velocity of light varies with the medium.
Describes how transparent objects may only retard light without diffracting it
Transform - diffraction - transform - image
Spatial information in the rear focal plane.
Spatial information is encoded in the diffracted rays.
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.