The I in the Acronym Name Roy G. Biv
This page is the CodyCross answer for the clue below from Physics, Group 1900, Puzzle 5 (Charge and Current).
Question is: The I in the Acronym Name Roy G. Biv
and the answer is: INDIGO
Word Meaning:
INDIGO — A purplish-blue color.
Definitions from Wiktionary.