[单选题]
Light has a wavelength of 600 nm9;i qzbszbv 6/ in /(9ectz) cdoi a vacuum. It passes into glass, which has an index of refraction of 1.50. What is thez)cic/ oet(9 d wavelength of the light in the glass?
A. $600 \; nm$
B. $500 \; nm$
C. $400 \; nm$
D. $300 \; nm$
