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Non-verbal Reasoning · Question 3 of 65

A plane mirror is placed along MN, on the right of the grid of 5 shaded squares.

Question 3

EasyOriginal question

A plane mirror is placed along MN, on the right of the grid of 5 shaded squares. Choose the figure that shows its reflection.

A 5 by 5 grid with 5 shaded squares, at (row, column) counted from the top-left: (1, 1), (1, 2), (1, 3), (2, 1), (2, 2). A vertical mirror line MN is drawn just to the right of the grid.
Options for question 3

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. A mirror standing along MN, to the right of the grid, swaps left and right but not top and bottom: a square in column c moves to column 6−c6 - c and stays in its row.

  2. So the shaded squares (1, 1), (1, 2), (1, 3), (2, 1), (2, 2) (row, column) move to (1, 3), (1, 4), (1, 5), (2, 4), (2, 5).

  3. Figure 3 shows exactly these squares.

Worth noting

Figure 1 is the water image (top and bottom swapped), Figure 2 is the grid turned upside down, and Figure 4 is the grid given a quarter turn. A mirror never turns a figure; it only flips it.

Concept
Mirror image in a vertical mirror
Typical time
40 s
Your time
—
The rule this testsMirror and water images
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