Physics
The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall

Depends on the area of the wall
Increases with depth of the wall
Increases with height of the wall
Depends on the thickness of the wall

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Physics
What is refractive index ?

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 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.
None of above

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