1) Understanding Option pricing :
a) Option premium is a function of Underlying price, Time to expiry, int rates, Strike price and most importantly implied Volatility (implied standard dev).....
b) All these factors are combined together in the form of BSM (Black Scholes Model) to arrive at the option premium.
c) Important thing to rem is BSM assumes implied vol (IV) as constant and hence for a given IV, premium is calculated....
This is a non technical explanation....
2) Understanding factors used for India VIX calculation:
....
a) Implied volatilities of Nifty near month most liquid OTM options. In the early part of the series it includes only the current month and as it progresses it includes the next month and scales down the IV to 30 day period.
b) The average IVs of the ....
the options described above reflects the VIX. This is an approximate explanation. The actual formula is slightly complex and can be found in the NSE website for those who are interested in mathematics of VIX.
3) VIX inference :
High VIX means higher uncertainty...
Now important thing to understand is that when VIX crashes it means options are pricing in lesser uncertainty (relatively); usually lesser uncertainty is accompanied with bull markets and that’s why in general it is perceived that VIX cools off in bull markets...
The most dangerous thing is that vix falling and also markets crashing. It implies option markets are pricing in lesser volatility, relatively with lesser uncertainty and the fact that market crash with lesser volatility can happen only when the direction ....
Hope I have covered a technical concept in a non technical manner.