Impervius Charm

Impervius is the incantation of a spell used to repel water off of a surface.

Known uses

 * Hermione Granger used this charm during a Quidditch game in 1993 on Harry Potter's glasses to help him see better while playing during a storm. Although this helped a little, Harry still had difficulty seeing.
 * Angelina Johnson also suggested using the charm for the same reason to her team when she was captain during the 1995–1996 school year.
 * Hermione Granger also used this unsuccessfully during the 1998 Break-In of Gringotts Wizarding Bank when trying to protect herself, Harry Potter, Ron Weasley, Griphook, and Bogrod from the Flagrante curse in the Lestrange Vault.

Notes and references
Импервиус