This is the speed of light in vacuum divided by the speed of light in the medium. this determines the amount of bending of a light wave

Refractive index.

Explanation:

Refractive index or the index of refraction may be defined as the quantity that measures how fast the light travels in different media. Different materials have different refractive index.

Refractive index can be calculated by the formula by dividing the speed of light in vacuum with the speed of light in different media. The amount of refraction and the bending of light as light enters from one media to another is shown by the refractive index.

Thus, the answer is refractive index.

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.