Question

why is mercury used in one side of a mirror
​

Answer 1

see the attachment mate this will help you

Answer 2

Answer:

Before 1940, mercury was the most commonly used metallic coating for mirrors because mercury is spread evenly over the surface of the glass and did not tarnish. ... These types of coating are used as reflectors, and as protective finishes on metallic coatings. In comparison with metal, they are more scratch resistant

Explanation:

I hope it helps you