Monochromatic light is refracted from air into the glass of refractive index \[\mu \]. The ratio of the wavelength of incident and refracted waves is [JIPMER 2000; MP PMT 1996, 2003]

• A.            1 : \[\mu \]                           
• B.            1 : \[{{\mu }^{2}}\]
• C.            \[\mu \] : 1                           
• D.            1 : 1