Hola strantor,
Thinking of that .0001", not sure if relevant: the surface will reflect every time whatever vibration affects the tank containing the liquid. Easy to see when inside a partly filled ballast tank of a ship. Just anyone hitting main deck with a hammer, many many metters away you could see the concentric mini waves riding the surface.
BTW, many years ago I spent some three hours of my valuable time as a Supercargo in a terminal upriver, watching a group of three guys giving the finish to the concrete floor of a future cold storage chamber (allowing to drain liquids instead of absorbing them).
Using kind of big size squeegees, dry cement, careful watering and a well defined sequence they managed to create a smooth and bright surface on the cement that was still setting. Sure, nobody mentioned precision, but surface was much much smoother after this.
Thinking of that .0001", not sure if relevant: the surface will reflect every time whatever vibration affects the tank containing the liquid. Easy to see when inside a partly filled ballast tank of a ship. Just anyone hitting main deck with a hammer, many many metters away you could see the concentric mini waves riding the surface.
BTW, many years ago I spent some three hours of my valuable time as a Supercargo in a terminal upriver, watching a group of three guys giving the finish to the concrete floor of a future cold storage chamber (allowing to drain liquids instead of absorbing them).
Using kind of big size squeegees, dry cement, careful watering and a well defined sequence they managed to create a smooth and bright surface on the cement that was still setting. Sure, nobody mentioned precision, but surface was much much smoother after this.