# Why does a subsonic nacelle inlet have a throat before the diverging section?

Aircraft propulsion 2nd edition by SAEED FAROKHI" p.340

Aircraft propulsion 2nd edition by SAEED FAROKHI" p.123

As we can see from the image, the nacelle slightly converges towards a throat, before diverging. Why?

Is it to produce the lip thrust force? If so, is that force independent of the diffuser thrust (i.e., the internal pressure rise in the diverging section) ?

And if the cowl lip represents an airfoil operating at a negative angle of attack, shouldnt the "lip thrust" be in the opposite direction?