Dr Naha has made significant contribution in the fields of structural geology of Precambrian geology. By combining the tectonic methods developed in the eastern and western Alps, he has traced an integrated geological history of Precambrian rocks around Ghatsila in Singhbhum, Bihar. Dr Naha's work in some of the oldest rocks in the Precambrian of Rajasthan has led to a revision of the structure and stratigraphy of the Aravalli-Raialo-Delhi rocks and the Banded Gneissic Complex. He has worked out the methods of elucidating the large-scale structure of migmatites. The geometry and kinematics of folds in general and superposed folds in particular have been worked out and the principles applied for elucidating the structure of the Precambrian terrain of Rajasthan and the Jutogh-Chail sequence in the Shimla Himalayas.