Physics
X-rays region lies between

Gamma-rays and ultraviolet region
Visible and infra-red region
Ultraviolet and visible region
Short radio waves and long radio waves

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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.
None of above
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.

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