The phrasing "index top" suggests you might be looking for the (Physics) or simply the top results/highlights.
In the classic Bollywood comedy Atithi Tum Kab Jaoge? , a hapless couple is terrorized by an uninvited guest who simply refuses to leave. Their home turns into a circus of frustration, patience wearing thin as they keep asking, "Dear guest, when will you leave?" atithi tum kab jaoge index top
In the context of "Index Top," this is most likely a reference to a classic physics application problem involving . The problem usually asks to calculate the time of death or the time elapsed, using the title "Atithi Tum Kab Jaoge" (Guest, when will you leave?) as a mnemonic for the variables. Index of Refraction The phrasing "index top" suggests