Below are some useful links on theory and applications in Microscopy
OLYMPUS Microscopy Resource Center. Kohler Illumination
OLYMPUS Microscopy Resource Center .
Specialised Microscopy Techniques
Introduction to Optical Microscopy, Digital Imaging, and Photomicrography
Microscopy and Digital Imaging
Nikon Microscopy .
Source for Microscopy Education
Royal Microscopical Society . International microscopical society