Mary's room

Mary is a brilliant scientist who has spent her whole life in a black and white room, learning about the world through black and white books and a black and white screen. She has learned everything physical there is to know about colour vision: the wavelengths, the retina, the neurons, the whole causal story from a ripe tomato to the word red. One day she is let out and sees a red tomato.

Does Mary learn something new when she sees red, and if she does, what follows about the claim that everything is physical?