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2:50

OLLI Online Course: Stephen King’s Different Seasons: Four Novellas

By: 92csicca

Stephen King has described Different Seasons as “a book with stories in it about an offbeat prison break, an old man and a boy locked up in a gruesome relationship based on mutual parasitism, a quartet of country boys on a journey of discovery, ...

2:44

Phase objects - continued

By: plintilh

Describes how transparent objects may only retard light without diffracting it

2:28

Transform - diffraction - transform - image

By: plintilh

Spatial information in the rear focal plane.

2:42

Zero order has no information

By: plintilh

Spatial information is encoded in the diffracted rays.

2:42

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.

1:28

Numerical Aperture vs useful magnification

By: plintilh

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

7:58

Deriving Numerical Aperture = N.A.

By: plintilh

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

4:13

Importance of Condenser N.A.

By: plintilh

Condenser N.A. must at least match that of the objective to realize full resolution.

4:32

Fourier musical analogy

By: plintilh

Complex frequency-based information can be decomposed into combinations of simple waveforms.