The frequency of a light ray is $6 \times 10^{14} \ Hz$. Its frequency when it propagates in a medium of refractive index $1.5$ will be:

  • A
    $1.67 \times 10^{14} \ Hz$
  • B
    $9.10 \times 10^{14} \ Hz$
  • C
    $6 \times 10^{14} \ Hz$
  • D
    $4 \times 10^{14} \ Hz$

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