1.For each of the following cases, give the relative magnitude of n1 and n2.
(Mention whether n1>n2, n1=n2 , n1<n2 or "Cannot tell").
http://www.flickr.com/photos/106157565@N07/11593641954/in/photostream/
可不可以解釋一下?
2.有沒有一些情況有critical angle 但無total internal reflection?