Question

please solve it please please please
please
please
please ​

Answer 1

Answer:

1) Normal

sorry, don't know 2nd part dear :-(

Answer 2

Answer:

3. Normal

According To the law of refraction :

The incident ray, reflected ray and the normal, to the interface of any two given mediums; all lie in the same plane.The ratio of the sine of the angle of incidence and sine of the angle of refraction is constant.

4. N2/N1

According To Snell's law:

In words, the formula above says that if a wave passes from material 1 to material 2, the ratio of the sines of the angles of incidence and refraction (θ1 and θ2) will be a constant number and this constant number is equal to the ratio of the transmitting velocities of the two materials (v1 and v2) as well as the inverse ratio of the indices of refraction of the two materials (n1 and n2)