An air bubble in water will work in the same way as

An air bubble in water (B) behaves similarly to a convex lens. When light passes through the curved surface of the bubble into water, it undergoes refraction. The convex shape of the bubble causes light rays to converge, similar to how a convex lens refracts light to converge at a focal point. As a result, an observer looking through the bubble sees a virtual image formed by the refracted rays. This virtual image appears upright and magnified, depending on the curvature and size of the bubble. This phenomenon illustrates the optical properties of convex lenses and their similarity to spherical convex surfaces in water. Concave mirrors (C) and lenses (D) would diverge light rays rather than converge them, producing different optical effects compared to the converging behavior of convex lenses and convex surfaces like air bubbles in water.