Physics
Out of the following pairs, which one does not have identical dimension?

Work and Torque
Moment of inertia and moment of a force
Impulse and Momentum
Angular momentum and Planck's constant

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Physics
What is refractive index ?

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

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