Define the refractive index of a medium.

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Bending of light passing from one medium to another.

Reflecting back light from a plain surface.

Both 1&2

None of the above

answer is A.

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Detailed Solution

The refractive index of a medium is the bending of light passing from one medium to another.
Refraction is the bending of light when it passes from one medium to another of different refractive indexes. This is due to the different speeds of light in different media of different optical densities. The measure of the bending of light when passing from one medium to another medium is known as the Refractive index of a medium.

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