A sensor for the detection of an analyte includes a first reagent in one section of the housing and at least a second reagent in another section of the housing. In a light-emitting device having a light-emitting element in which a first electrode on a base substrate, a functional layer having a light-emitting layer, and a second electrode are sequentially deposited, the first electrode and the second electrode are reflective, and the second electrode has an opening through which light from the light-emitting layer passes. 5; and q+2y=z, wherein z is the valence of M. The brewed beverage is captured in a second, temporary container from which it may be consumed or served. During zooming, the second lens unit does not move and the distances between the adjacent lens units change.