There are 2 main laws of Refraction of Light
The Incident Ray,Refracted Ray and Normal Ray all lie on the same plane
The Ratio of sin of Angle of Incidence and Angle of Refraction is constant for a particular medium
This constant is called Refractive Index
It is actually called Refractive Index of the second medium with respect to the first medium.
The second law of refraction is also called Snell's Law
Let's do some examples
Suppose for a ray of Light. Angle of Incidence = 37° and Angle of Refraction = 24°. Find Refractive Index
(Given: sin 37° = 0.6 and sin 24° = 0.4)
A beam of light passes from air into a substance X. If the angle of incidence be 72° and the angle of refraction be 40°, calculate the refraction index of substance X.
(Given: sin 72° = 0.951 and sin 40° = 0.642 )