[1] V B S Purvanchal Univ, Prof Rajendra Singh Rajju Bhaiya Inst Phys Sci Stu, Dept Phys, Jaunpur 222003, India
[2] V B S Purvanchal Univ, Prof Rajendra Singh Rajju Bhaiya Inst Phys Sci Stu, Ctr Renewable Energy, Jaunpur 222003, India
[3] Univ Allahabad, Dept Phys, CMP Degree Coll, CMP Degree Coll, Allahabad 211002, India
[4] Guru Ghasidas Vishwavidyalaya, Dept Pure & Appl Phys, Bilaspur 495009, India