A light ray of frequency v and wavelength $\lambda$ enters a liquid of refractive index 3/2. The ray travels in the liquid with

• A

  frequency v and wavelength $\left(\frac{2}{3}\right)\lambda$

• B

  frequency v and wavelength $\left(\frac{3}{2}\right)\lambda$

• C

  frequency v and wavelength $\lambda$

• D

  frequency $\left(\frac{3}{2}\right)$ v and wavelength $\lambda$