Reflection

The reflection is so clear because there is no light coming from the surface through the water to the camera. This is because of total internal reflection; the light coming from the surface is reaching the surface of the water at an angle beyond the critical angle, thus instead of being refracted, the light is reflected back through the water such as it does not reach the camera. However, some of the light that comes from the outside scenery is refracted into the water and is not reflected to the camera like the rest of the light. This accounts for the fact that the reflection seen on the water is darker than the actual objects.