Select the correct mirror image of the given figure when the mirror is placed at MN as shown.

Correct — C. MN is drawn as a vertical line standing to the right of the figure, so the reflection is a left-right flip. Heights are untouched; sides swap.

Three markers settle it. In the given figure the narrow twin-line strip runs down the left edge, the solid black square sits top-centre, and the black circle sits in the lower-right inside a smaller square, crossed by a diagonal that climbs from bottom-left to top-right.

After a left-right flip the strip must be on the right edge, the black square must stay top-centre, and the circle must move to the lower-left with its diagonal now descending from top-left to bottom-right.

Option (c) shows all three, including the reversed diagonal.

Why the others are wrong

• (a)
  Option (a) keeps the twin-line strip on the left and lifts the black circle to the top-right. That is a top-bottom flip, which is what a horizontal mirror below the figure gives, not the vertical MN printed here.
• (b)
  Option (b) lays the twin-line strip horizontally along the bottom and puts the black square at the left-middle. A reflection preserves a stroke's direction, so a strip turned through 90 degrees means a rotation.
• (d)
  Option (d) sends the twin-line strip to the top as a horizontal band and the black square to the right-middle. Again the strip has rotated rather than reflected, so the figure cannot be the mirror image.

A mirror image is a reflection across MN, and the line's direction decides everything. A vertical MN swaps left and right and leaves top and bottom alone; a horizontal MN does the reverse.

Do not try to redraw the figure. Pick two or three asymmetric markers — an edge strip, a filled shape, a diagonal — and work out where each must land. An option that misplaces one marker is out, whatever else it gets right.

Diagonals are the most reliable marker of the three, because a reflection reverses a diagonal's slope while a rotation can preserve it.

Key facts

• MN here is vertical and stands to the right of the figure, so the transformation is a left-right flip.
• A vertical mirror leaves every element at the same height.
• The diagonal through the black circle climbs left to right in the given figure and must descend left to right in its mirror.
• A rotation can move a shape to the opposite side without reversing any diagonal, which is what separates it from a reflection.

Common traps

• Treating the mirror image as a 180-degree rotation, which also moves left to right but inverts top and bottom too.
• Comparing only the large filled shapes and skipping the thin edge strip, which is what separates the options here.
• Flipping the figure but leaving the diagonal's slope unreversed.

No directly related past PYQ was found.