I) The Law of refraction of light, also known as Snell's Law, states that for a given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constan

b)

i) The Law of refraction of light, also known as Snell's Law, states that for a given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant. Additionally, the incident ray, the refracted ray, and the normal to the interface all lie in the same plane.

ii) The refractive index of a material is defined as the ratio of the speed of light in a vacuum to the speed of light in that material. If the refractive index of a material is 1.33, it means that the speed of light in that material is 1.33 times slower than its speed in a vacuum.