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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.

3:35

Spatial deteil vs acceptance angle

By: plintilh

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

2:25

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.

1:50

Diffraction pattern in the transform plane

By: plintilh

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

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.

2:38

Acceptance angle vs working distance

By: plintilh

Working distance decreases with increasing acceptance angle.

7:58

Deriving Numerical Aperture = N.A.

By: plintilh

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