A student when discussing the properties of a medium ( except vaccum) writes Velocity of light in vaccum = Velocity of light in medium This formula isA. Dimensionally correctB. Dimensionally incorrectC. Numerically incorrectD. Both `a and c`

A student when discussing the properties of a medium ( except vaccum)

1.	A student when discussing the properties of a medium ( except vaccum) writes Velocity of light in vaccum = Velocity of light in medium This formula isA. Dimensionally correctB. Dimensionally incorrectC. Numerically incorrectD. Both `a and c`
Answer» Correct Answer - D The formula can be written as `("Velocity of light in vaccum") /("Velocity of light in medium") = 1` This formula is dimensionally correct as both the sides are dimensionless. Numerically , this ratio is equal to refractive index which is greater than `1`. Hence , the equation is numerically incorrect.

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A student when discussing the properties of a medium ( except vaccum) writes Velocity of light in vaccum = Velocity of light in medium This formula isA. Dimensionally correctB. Dimensionally incorrectC. Numerically incorrectD. Both `a and c`

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