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A drop of water acts like a magnifier because the curved surface of the water drop can bend light rays passing through it. This bending of light can make objects underneath the water drop appear larger and closer when viewed from the other side of the drop. This effect is known as refraction.
An air bubble in water will act like a concave lens. This is because the diverging effect on light rays passing through the air-water interface creates a virtual focus point on the opposite side of the bubble, similar to a concave lens.
Water can act as a mirror due to its smooth surface that reflects light. When light hits the surface of water at a certain angle, it is reflected back, creating a mirror-like effect. This phenomenon is known as specular reflection.
The surface tension of water allows it to act like a "skin" on its surface. This property is a result of the cohesive forces between water molecules, which causes them to stick together and form a surface layer that can support small objects or insects.
When the water is still, it acts like a mirror, reflecting the image of the tree above it. However, when the water is disturbed, ripples are created on the surface that distort or break up the reflection, making it difficult to see the tree clearly.
Water bubbles do act like convex lenses in that they can refract light and create a focused image. The curved surface of a water bubble causes light rays passing through it to converge, similar to how a convex lens works. However, the optical properties of a water bubble are not as precise as those of a manufactured lens.