Hello Sahil!
If you want to pursue physics field in IIT then it is very good.According to my knowledge doing Bs -Ms from physics department from old IIT's is more beneficial in comparison to new IIT's because in old IIT's there are lots of opportunities in research field and professors are also good.
Hope it answer your concerns .
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile