Image of a birefringent sample when placed between crossed polarizers using a red selenite compensator. Sample at the 0° position.
Image of the same sample when placed between crossed polarizers using a red selenite compensator. Sample at the 45° position.
Unknown sample as visualized using crossed nicols. Note the highly birefringent inclusion.
The same sample when visualized in brighfield illumination.
These images use a #3 objective from Leica microscope #211.
The analyzer was a Polaroid sheet.
The compensator was a "Red" selenite plate placed under the sample.