Conversation so far:
Why was the research unpublished?
What was one of the unpublished research?
One such example is his work in the theory of spectroscopy.
What was his unpublished research about?
One such example is his work in the theory of spectroscopy.
Did any of his research ever get published?
In 1849 he published a long paper on the dynamical theory of diffraction, in which he showed that the plane of polarisation must be perpendicular to the direction of propagation.

Question: Did he go to school to learn about the research?
Self-contained rewrite: Did he go to school to learn about the research?