Question

which of diagrams a and b shows a correct reflection in the mirror line marked m?

Explanation:

To determine the correct reflection, we check the property of reflection: the mirror line (m) should be the perpendicular bisector of the segment joining corresponding points of the original and reflected figures. In diagram B, the upper and lower squares are congruent and their corresponding points are equidistant from the mirror line m, maintaining symmetry. In diagram A, the sizes of the squares are different, so it does not represent a correct reflection.

Answer:

B. Diagram B