Select the correct statement about the reflection and refraction of a wave at the interface between medium $1$ and medium $2$.

  • A
    Reflected wave has a phase change of $\pi$.
  • B
    Wavelength of reflected wave is less than that of incident wave.
  • C
    Frequency of transmitted wave is same as that of incident wave.
  • D
    Frequency of wave changes as per nature of boundary.

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