Answer:
★The second law of refraction
The ratio of sine of angle of incidence to the sine of angle of refraction is a constant for a light of given colour and for a given pair of media. This law is also called Snell's law of refraction. If 'i' is the angle of incidence and 'r' is the angle of refraction then, Sin i/Sin r = constant
This constant value is called the refractive index of the second medium with respect to the first.
She is

kilometers away from her starting point
Answer:
Solid, Liquid and Gas
Explanation:
They are the 3 states or stages of Matter
The set of all sets that are not members of themselves. This contradiction is Russell's paradox.