Physics
Which one of the following physical quantities has the same dimensions as that of Planck's constant?

Force
Potential energy
Linear momentum
Angular momentum

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Physics
What is refractive index ?

None of above
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
It is defined as the product of speed of light in medium and in vacuum.
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

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