Physics
What is refractive index ?

None of above
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.

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Physics
'Mirage' is an example of

Dispersion of light only
Refraction of light only
Refraction and total internal reflection of light
Total internal reflection of light only

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