Which one of the following statement about the refractive index of a material medium with respect to air is correct?

It can be either positive or negative

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It can have zero value

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It is unity for all materials

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It is always greater than one

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Solution

The correct option is D It is always greater than one
Velocity of light in a medium = $\frac{c}{μ}$
since velocity of anything cannot be greater than c in any case hence $μ$ >1

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Which one of the following statement about the refractive index of a material medium with respect to air is correct?

The correct option is D It is always greater than oneVelocity of light in a medium = cμsince velocity of anything cannot be greater than c in any case hence μ >1

The correct option is D It is always greater than one
Velocity of light in a medium = $\frac{c}{μ}$
since velocity of anything cannot be greater than c in any case hence $μ$ >1