Ravindra Ganpati Gaikwad

Ideal Smix will be reached when the minimum Gibbs energy of spontaneous emulsion formation is reached. Typically, such a region is found by obtaining the phase diagram of the emulsion. See the article for details.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2663668/

I definitely agree with Yuri Mirgorod approach for this answer, very precise.

Dear Ravindra Ganpati Gaikwad ;

The ideal emulsion, the emulsifier is equally attracted to the water phase and the oil phase. If the balance is tipped in either direction, the emulsifier may lose contact with the phase to which it is less attracted, causing the emulsion to break down.

Emulsifiers with HLB values greater than 10 are more hydrophilic and thus better at stabilizing o/w emulsions. In contrast, emulsifiers with HLB values less than 10 are more hydrophobic and therefore better suited for w/o emulsions. For more details can read the following reference;

https://www.aocs.org/stay-informed/inform-magazine/featured-articles/emulsions-making-oil-and-water-mix-april-2014?SSO=True