This paper introduces a showcase of an AR-based science exploration using smart glass. A gamified AR-based science laboratory session on the convex lens image forming, called The Dragon Fighter, was developed to support junior high school students to learn science concepts via AR-based exploration and game-play challenges. The results of the user test suggested that (a) the AR-based exploration helped learners acquire and apply science concepts, (b) participants showed positive motivation toward the AR-based exploration, and (c) participants preferred using smart glasses to do AR-based science exploration.