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CBSE XII
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Physics
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Communication systems
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The sky wave with a frequency of $50\;MHz$ is incident on D- region at an angle of $30^{\circ}$ then angle of refraction is
$\begin{array}{1 1} 12.5 ^{\circ} \\ 15^{\circ} \\ 30^{\circ} \\ 45^{\circ} \end{array} $
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