From the article: "MBDA's tests have also helped to debunk the science-fiction idea that reflective armour would defend against laser weapons. They found that

From the article: "MBDA's tests have also helped to debunk the science-fiction idea that reflective armour would defend against laser weapons. They found that any dust on the mirrored surface would get burned in, and lead to the destruction of the target even faster than with a non-reflective surface." gliese1337 also explained it more in details in this thread.