Arjuna expresses his desire to see — Arjuna has heard that Krishna, who stands before him on the chariot, supports and pervades the entire universe (Bg. 10.42); and thus Arjuna expresses his desire to see that form
aWhy Arjuna requests Krishna to show His Universal Form (4 points):
1To establish Krishna’s divinity for all (11.1 purport)
2To convince others, although he does not have any personal desire and is completely satisfied to see Him in His personal form of Krishna (11.3 purport)
Lord is addressed as Purushottama – Implies that Lord as Supreme Personality of Godhead, knows the heart of Arjuna, that he has no personal desire to see
3To avoid imposters — Wants to set a criteria for in the future there will be so many imposters who will pose as incarnations of God (11.3 purport)
4Arjuna, as a responsibility, wants to substantiate Krishna’s statement — so that in the future people can understand that Krishna “not only theoretically or philosophically”, but ‘actually’ presented Himself as such to Arjuna – Arjuna fulfils his responsibility because he is the beginning of the Parampara (11.8 purport)