If a light ray is travelling from medium of refractive index 'n1' to the medium of refractive index 'n2' such that angle of incidence is 'i' and angle of refraction 'r' (assuming n1/n2 is equal to ______.
1
\(\frac{\sin i}{\sin r} \quad\)
2
\(\sin r - \sin i \quad\)
3
\(\frac{\sin r}{\sin i}\)
4
\(\sin i - \sin r \quad\)