Physics
Which one of the following instruments is used to study dispersion of light ?

Photometer
Telescope
Spectrometer
Microscope

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

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