Light enters a transparent substance with refractive index $n$. The angle of incidence at the surface of the transparent substance is $i$. Which equation is used to determine the angle of refraction $r$?
- A$r=n\sin i$
- B$i=n\sin r$
- C$\sin r=\dfrac{n}{\sin i}$
- D$\sin r=\dfrac{\sin i}{n}$