I would say your answer is...... The strongest voice in shaping foreign policy belongs to the President.
It is declared under the United States constitution that the President
gets to decide foreign policy, but the Congress is allowed to ratify
treaties.
Answer:
The critical angle is ![ac =sin^{-1}\frac{n_2}{n_1}](https://tex.z-dn.net/?f=ac%20%3Dsin%5E%7B-1%7D%5Cfrac%7Bn_2%7D%7Bn_1%7D)
Explanation:
Snell's law is mathematically represented as
![n_1 sin \theta_1 = n_2 sin \theta_2](https://tex.z-dn.net/?f=n_1%20sin%20%5Ctheta_1%20%3D%20n_2%20sin%20%5Ctheta_2)
Where
is the refractive index of medium 1
is the refractive index of medium 2
Now substituting
for
and ac which denotes the critical angle for ![\theta_1](https://tex.z-dn.net/?f=%5Ctheta_1)
![n_1 sin (ac) = n_2 \ sin(90)](https://tex.z-dn.net/?f=n_1%20sin%20%28ac%29%20%3D%20n_2%20%5C%20sin%2890%29)
Making ac the subject
![ac =sin^{-1}\frac{n_2}{n_1}](https://tex.z-dn.net/?f=ac%20%3Dsin%5E%7B-1%7D%5Cfrac%7Bn_2%7D%7Bn_1%7D)
From the question we are told that ![n_1 > n_2](https://tex.z-dn.net/?f=n_1%20%3E%20n_2)
The is implies that ac < 90
since ![\frac{n_2}{n_1} < 1](https://tex.z-dn.net/?f=%5Cfrac%7Bn_2%7D%7Bn_1%7D%20%3C%201)
Critical angle is that angle of incidence that result to a 90 degree angle of refraction
Magma, first, outer layer, inner layer