1. School of Allied Sciences , , Bhimtal 263136, Uttarakhand, India
2. Graphic Era Hill University, Bhimtal Campus , , Bhimtal 263136, Uttarakhand, India
3. P.N.G. Govt. P. G College Department of Physics, , Ramnagar, Nainital 244715, India
4. S.S.S.T.S.R. Govt. Degree College Nainidanda Department of Physics, , Pauri 246277, India
5. LSMGPG College Department of Chemistry, , Pithoragarh 262501, Uttarakhand, India