Answer: n = c / v" "c" is the speed of light in a vacuum, "v" is the speed of light in that substance and "n" is the index of refraction. According to the formula, the index of refraction is the relation between the speed of light in a vacuum and the speed of light in a substance.
Explanation: the relation is the vacuum and the speed of light in a substance.
A solenoid hope this is right
b
the more mass something has the more force it takes to move said object.
It might help if this is in the biology area but i'll answer anyways. Your answer is C. Every environment has living and nonliving things. Tree, plants, animals, grass, tree bark, water, etc.
