Question

a, b, or c

Answer 1

optical Deal or No Deal??!!

i am truly missing the subtlety so i am going with A :p

Answer 2

Figure a: suggests that the rays bend once, when they are in the middle of the lens.

This is ridicules.

Answer 3

Rays bend when they cross between media of different refractive index.

Answer 4

ah

subtle indeed!

Answer 5

Figure b is also ridiculous, with the rays bending at the incident surface of the lens, but Not as it re-emerges in to air. The angle (relative to the normal) should be the same at both boundaries.