Answer:
There are many types of magnets, which are generally divided into two categories: permanent magnet and a soft magnet.
Explanation:
Answer:
The index of refraction of the first medium must be higher than the index of refraction of the second medium
Explanation:
Snell's law describes the behaviour of light at the boundary between two mediums:
![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
n1 and n2 are the index of refraction of the two mediums
are the angle between the direction of the light ray and the normal to the interface
We can rewrite the condition as:
![sin \theta_2 = \frac{n_1}{n_2} sin \theta_1](https://tex.z-dn.net/?f=sin%20%5Ctheta_2%20%3D%20%5Cfrac%7Bn_1%7D%7Bn_2%7D%20sin%20%5Ctheta_1)
Let's assume now that the light is travelling in the first medium with a very large angle with respect to the normal to the surface, i.e.
, so that
. In this case, we have
![sin \theta_2 = \frac{n_1}{n_2}](https://tex.z-dn.net/?f=sin%20%5Ctheta_2%20%3D%20%5Cfrac%7Bn_1%7D%7Bn_2%7D)
We notice that if
, the ratio on the right is larger than 1, and so the term
should be also larger than 1: but this is not possible of course, since the sine function is always less than 1. Therefore, in this case total internal reflection occurs, because no refracted ray is produced.
Idkggghh j hhjj 99th yuuuu
Gamma waves are on the far right
Your answer would be B.
<span>votre réponse serait B</span>