To trace the path of ray of light through the triangular glass prism, a student observes that the emergent ray has

In the setup shown below, a clear image of a distant object is obtained on the screen. The focal length of the concave mirror is:

In the experiment on refraction of light through a rectangular glass slab done by four students A, B, C and D, the following observations were made:

(a) The emergent ray moves towards the normal after second refraction through glass slab with i = e

(b) The emergent ray moves away from the normal after second refraction through glass slab ∠ i < ∠e

(c) For any angle of incidence, always ∠I ˃ ∠e, always.

(d) The emergent ray moves away from normal after second refraction through glass slab with ∠i = ∠e

The student who has made the correct observation is:

The diagrams A and B represent the following relationship:

Identify the parts labeled 1 and 2 in the adjoining figure