The refractive index of transparent medium is greater than one because a. Speed of light in vacc...

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The refractive index of transparent medium is greater than one because
a. Speed of light in vaccum speed of light in transparent medium
b. Speed flight in vaccum \( = \) speed of light in transparent medium
c. Speed of light in vaccum \( \) speed of light in transparent medium
d. Speed of light wave changes when it moves from rarer to denser medium
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