Abstract: A shot glass is formed with a sloping, slightly tapered side wall. A curved cup bottom wall extends across the bottom of the shot glass and is spaced upward from the bottom edge of the shot glass side wall. The cup bottom wall has a thicker central portion and a thinner annular peripheral portion, and upper and lower surfaces of the cup bottom wall are formed with different radii of curvature. The bottom surface has a larger radius and the upper surface has a smaller surface for forming a lens. The base has a base wall and a peripheral side wall which extends upward from the base wall. A thin peripheral ring extends downward from outer edges of the base wall to form a foot. The cylindrical side wall of the base has a flat upper surface on which is formed an energy directing bead. The side wall of the base fits inside a bottom edge of the shot glass, and the energy directing bead contacts an inner step in the shot glass side wall slightly above the lower edge.