Term "Magnified" - The Elements of Cinema (Steffan Sharff)

[Prasad Kumar]

I am reading a movie analysis on the film Notorious. In that, I came across this passage:

"...the “master” is used as a bookend — opening and closing the scene — which is “magnified” (a term coined by Steffan Sharff in The Elements of Cinema) by the two shots that render Devlin and Prescott in separation."

I don't clearly understand what  the author means by "magnified"? Can someone please clarify this? (2-shot when magnified becomes a single shot?)