[单选题]
When a beam of light (wavelength = 590 nm), or 3/7v*lgyolyax d6 i4riginaldxrz,5p l(k4mp xn,:r ly traveling in air, enters a piece of glass (index of refraction 1.50), p(k prd, rmzx nx4,5l: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