Physics
Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

Impulse and moment of force
Pressure and Young's modules
Planck's constant and Angular momentum
Force and rate of change of linear momentum

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Physics
'Mirage' is an example of

Refraction of light only
Refraction and total internal reflection of light
Total internal reflection of light only
Dispersion of light only

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