* Calm Water: When the water surface is still, it acts like a giant mirror. Light from the tree bounces off the smooth surface and travels to your eyes, creating an upside-down image of the tree.
* Windy Day: When the wind blows, the water surface becomes choppy and uneven. The light from the tree is scattered in all directions, making the reflection blurry and indistinct. The image is disrupted because the light rays no longer bounce back to your eyes in an organized way.
In short: A calm water surface acts as a mirror, providing a clear reflection. A windy surface disrupts this mirror-like effect, blurring the reflection.
