The figure shows the path of a ray of light as it passes through three different materials with refractive indices n1, n2 and n3. The figure is drawn to scale. What can we conclude concerning the indices of these three materials?
[Figure: Light ray bending as it passes through three media with refractive indices n1, n2, n3]
(a) n3<n2<n1.
(b) n3<n1<n2.
(c) n2<n1<n3.
(d) n1<n3<n2.