Index.of Jpg Red Pantyhose Propagation Of Light?

Propagation of Light? - index.of jpg red pantyhose

Image Link:
http://session.masteringphysics.com/problemAsset/1010865/25/99868A.jpg

QUESTION:
If the red wavelength of 700 (\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ rm) nm in the air between the glass refractive index of 1.5, the wavelength lambda of the light in the window?
Express your answer in nanometers to three significant figures.