This is a demonstration program to see the sequence of phase shifting 
images being used by some of the standard PST algorithms. The image 
sequence could be used to align the polariscope correctly.

The images are theoretically generated for the problem of a disc under
diametral compression.

Meaning of icons
Circular - The incident light on the model is circularly polarised. 
Plane    - The incident light on the model is plane polarised. 

When you click these icons, appropriate sub-menu appears listing  the 
respective PST algorithms. When a particular PST algorithm is selected, 
another submenu will appear with the list of images. The image sequence 
follows the optical arrangement listed in the book.

For plane polarised light being incident on the model see Table 5.2. 

For circularly polarised light being incident on the model see Tables 
5.3 and 5.9.
