Physics
Blotting paper absorbs ink due to

Siphon action
Diffusion of ink through the blotting
Viscosity of ink
Capillary action phenomenon

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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 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.
None of above

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