Final answer:
The condition where a nail takes on a concave shape that resembles a spoon is called koilonychia, often linked to iron deficiency anemia and other health conditions.
Step-by-step explanation:
The condition where a nail looks like a spoon is called koilonychia. When observing koilonychia, you'll notice that the nails are concave in shape and can appear to be scooped out. This nail finding can be associated with iron deficiency anemia and other health conditions. While the procedure described involves observing reflections using the back and the front (bowl side) of a spoon, this is a separate concept and relates to the physics of light and reflection, not directly to the health condition of koilonychia.