RRB Assistant Loco Pilot and Technician Model Paper 15 with key

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Question : 22 of 100

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The refractive index of a medium is equal to?

$\text "Speed of light in vacuum" / \text "Speed of light in medium"$
$\text "Speed of light in medium" / \text "Speed of light in vacuum"$
$\text "Speed of light in vacuum"×\text "Speed of light in medium"$
None of these

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