Mirror Images — Mains Strategy

Mains Strategy

These are written spatial-reasoning exercises, not a descriptive CSAT examination format. Begin by identifying the mirror line and stating the transformation: 'Reflection across a vertical line preserves height and reverses equal perpendicular distances.' That sentence gives the reader a rule against which the later diagram can be checked.

In the body, select two or three labelled points or features and show their original and reflected positions. If the line is x = a, demonstrate how the midpoint of each original-image pair lies on that line. Compare the result with a half-turn using one off-axis point; explain that a half-turn also reverses vertical placement. For a marked shape, include the interior rather than only its boundary.

Conclude by applying the same reflection again and recovering the original. This checks the operation without relying on visual familiarity. If the source figure or font is ambiguous, state the precise shape assumed or redraw it using coordinates. A clear argument should establish why the selected image is required and why a plausible rotated alternative fails.