Water droplets form on the mirror when positioned over the pot in this set up water?

Water droplets form on the mirror when positioned over the pot due to condensation. As steam rises from the boiling water in the pot, it cools upon contact with the cooler surface of the mirror. This cooling causes the water vapor to lose energy and transition into liquid droplets, which appear on the mirror's surface. The process is a common demonstration of the principles of condensation and temperature differences.