[单选题]
When a beam of light (w1s u4lrkjte3vmg f:,;avelength = 590 nm), originally 61fihn 2dpdtt,xk y.o b8g4:ytraveling in air, enters a piece of glass (index of refractioox128dbti, 4nfyp ty :6.hgkd n 1.50), its wavelength
A. increases by a factor of 1.50.
B. is reduced to 2/3 its original value.
C. is unaffected.
D. none of the given answers