4:13

Importance of Condenser N.A.

By: plintilh

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

7:58

Deriving Numerical Aperture = N.A.

By: plintilh

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

1:28

Numerical Aperture vs useful magnification

By: plintilh

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

2:38

Acceptance angle vs working distance

By: plintilh

Working distance decreases with increasing acceptance angle.

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.

1:50

Diffraction pattern in the transform plane

By: plintilh

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

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.

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

2:42

Zero order has no information

By: plintilh

Spatial information is encoded in the diffracted rays.