In the sentence, The orange juice box was in the new refrigerator, the
prepositional phrase is in the new refrigerator. This phrase answers
the question Where (is the orange juice box)? The object of the preposition
is refrigerator. The modifier, or describer, is new.
The compound objects of the preposition are two or more objects, such as
Mom (and) Dad in the sentence, The party was paid for by Mom and Dad.