Which of the following best describes images formed by a convex mirror?
O
A. Real or virtual; larger than, smaller than, or same size as object
O
B. Real; larger than object
O
C. Virtual; smaller than object
O
D. Real and larger than object or virtual and smaller than object

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?