Comment on Our Story till now...
It’s because of bonus the strike has gone down( previous stike/adjustment factor) and lot size is increased (previous lot size*adjustment factor), adjustment factor is 1.5 in this case as bonus is in the ratio of 1:2. This is just an accounting change where the initial value will remain the same. One can type nifty index on search to see all nifty indices and can add the required one on to market watch.