Mango is not only a fruit, it also means handle.
And lupa means magnifying glass (with a handle).
Lupa went on my little list of words on the kids' homework today that I didn't know. When I first looked it up in a Spanish dictionary, the definition it gave was "lente de aumento con un mango". Now I got the magnifying lenses part, but I didn't understand the mango part...why does the lens have a mango? (Why not an apple or a strawberry? Or better yet, a lucuma?) It makes for a funny mental picture. It makes much more sense now that I have learned that it also means handle, but I kind of like the idea of the mango.