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Transform - diffraction - transform - image

By: plintilh

Spatial information in the rear focal plane.


Zero order has no information

By: plintilh

Spatial information is encoded in the diffracted rays.


Spatial deteil vs acceptance angle

By: plintilh

Acceptance angle of objective must be wide enough to collect at least first order diffracted rays


See back focal plane using telescope

By: plintilh

The rear focal plane of the objective can be observed using a telescope insert into the eyepiece tube.


Diffraction pattern in the transform plane

By: plintilh

Demonstration of diffraction patterns in a test object - (Diatom test slide).


Spatial filtering in the transform plane

By: plintilh

Using a small aperture slider to remove diffracted orders in the transform plane eliminates detail in the image plane.


Acceptance angle vs working distance

By: plintilh

Working distance decreases with increasing acceptance angle.


Numerical Aperture vs useful magnification

By: plintilh

A quick estimate of useful magnification: N.A. X 1000.


Deriving Numerical Aperture = N.A.

By: plintilh

The geometries of diffraction patterns must match the geometries of acceptance angle.