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  • 09-02-2024
  • Physics
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In a medium the speed of light wave decreases to 0.2 times to its speed in free space The ratio of relative permittivity to the refractive index of the medium is x:1. The value of x is ______ .(Given speed of light in free space =3×10⁸ms⁻¹ and for the given medium μr=1)

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