You don’t get this amount. Holders of Futures and Options contracts are not eligible for dividends. As BPCL has declared dividend which is > 5% of the market price of the stock, it is considered as an extraordinary dividend.
So on the ex-date, the price of F&O contracts is adjusted. The adjustments are carried out in such a way that the value of the position of the market participants, on the cum and ex-dates for the corporate action continues to remain the same as far as possible. You can check out this example of REC for more information: Adjustment of F&O contracts in REC Limited