Is there any way to calculate nifty option price exactly?

F&O
1

B&S formula has been used in arriving nifty option price, but it always gives theoretical value. But how does the practical value is arrived.

Why always there is a difference in option price calculators and real value ? Is there anyway to calculate the exact value of the option price ?

I’m here referring to only NIFTY options not in any stocks.

2

It doesn’t matter whether it is Nifty or BN or any other index or stock.
The price of option is determined by Bid/Ask or supply/demand.

But this raises another question(i don’t know the answer) that if option price is solely dependent on bid/ask, why does it follow the B&S formula and things like price going down at the expiry?