Affiliation: | 1. Department of Physics, DSB Campus, Kumaun University, Naini Tal 263 002, Uttarakhand, India;2. Department of Physics, MBPG College, Haldwani, Kumaun University, Naini Tal, Uttarakhand, India;3. Aryabhatta Research Institute of Observational Sciences (ARIES), Naini Tal 263 129, Uttarakhand, India |