Physics
Magnifying Glass is basically a

Plano-concave lens
Cylindrical lens
Concave lens
Convex lens

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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.
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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