After B.Sc Hons in Physics, you must pursue M.Sc. in Physics, perhaps from some of the Higher Technical Institutes like IITs, IISERs or Top Central Universities. After Post Graduation, you must pursue PhD either from Universities Abroad or Top IITs, IISc Bangalore, IISERs or Universities having an excellent Academic and Research Outlook. After Doctorate, you may begin your career in Research, Industry or Academia, in relevant domain of interest.