If Light from a 336-Nm Monochromatic Source in Air Is

Multiple Choice

If light from a 336-nm monochromatic source in air is incident upon the surface of fused quartz (n = 1.56) at an angle of 60°,what is the wavelength of the ray refracted within the quartz?

A) 138 nm
B) 215 nm
C) 524 nm
D) 818 nm
E) 336 nm