Physics
What is refractive index ?

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

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Physics
Negative feedback in amplifiers

Increases bandwidth and decreases noise
Increases bandwidth and increases noise
Decreases bandwidth and decreases noise
Decreases bandwidth and increases noise

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