How output loading effect of a feedback amplifier is calculated?

This is a negative feedback amplifier circuit. The output loading factor is given by Rib/(Rib+Ro). When circuit is loaded with RL, loading factor becomes (Rib||RL)/((Rib||RL)+Ro).

What is Rib exactly in this case? Is it the combined resistance of potentiometer and input resistance (100k) of the feed back amplifier?If the potentiometer is set at the initial position such that voltage transfer ratio of the feedback network to be 1, (B=-100k/100k), will the output loading factor become 0?

This looks suspiciously like course work from a  teaching institution. If so, then how about you give the forum the benefit of your insight into what is going on, and  you could then get useful feedback,cheers,Richard

I've been working with opamps since before the 741 was available, and I am unfamiliar with the terms Rib and output loading factor. Could you educate me as to their meanings?