Broking risk manager

#1
Hi

Can anyone guide me the duties and responsibility of broking risk manager.

Further want to know how to calculate exposure margin and notional value in case of index option

As per nse website below is the definition

For this purpose notional value means:
- For a futures contract - the contract value at last traded price/ closing price.
- For an options contract - the value of an equivalent number of shares as conveyed by the options contract, in the underlying market, based on the last available closing price.

want to know how to calculate notional value in case of index option.