A light ray of frequency ' $v$ ' and wavelength ' $\lambda$ ' enters a liquid of refractive index $\frac{3}{2}$ The ray travels in the liquid with

• A

  frequency $v$ and wavelength $\left(\frac{1}{2}\right) \lambda$
• Correct answer
  B

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

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

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

Hence, the correct answer is option: 'B'.