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##WHAT IS REFRACTIVE INDEX​

Answer 1

Answer:

In optics, the refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as where c is the speed of light in vacuum and v is the phase velocity of light in the medium.

Answer 2

Answer:

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Hemophilia is a bleeding disorder that slows the blood clotting process . People with this condition experience prolonged bleeding or oozing following an injury, surgery, or having a tooth pulled.