Sagot :
Explanation:
When the rays are refracted 90 degrees from normal, they travel along the boundary in the fast layer. Ray paths aimed at the layer at more than a critical angle will have all the energy reflected back to the surface.
Explanation:
When the rays are refracted 90 degrees from normal, they travel along the boundary in the fast layer. Ray paths aimed at the layer at more than a critical angle will have all the energy reflected back to the surface.