Rakesh performs the experiments on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He observes that in all cases
A. `angle i gt angle r " but " angle i = angle e`
B. `angle i lt angle r " but " angle i =angle e`
C. `angle i gt angle e " but " angle i = angle r`
D. `angle i lt angle e " but " angle i = angle r `