Identify the true mirror image of the figure amongst the answer figures with respect to X-X
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The mirror X-X is vertical and on the right, so the image is the figure flipped left to right: the black corner squares swap sides and each pattern moves to the opposite side.
The mirror line X-X is vertical, on the right of the square, so the mirror image is the figure flipped left to right (top stays top, left becomes right). In the question figure there is a black square at the top-left and one at the bottom-right. After the flip the black squares must be at the top-right and the bottom-left. This rules out options (1) and (2). The question figure has a set of parallel diagonal lines in the upper-right, a single diagonal from the top-left black square to the centre, parallel diagonals in the lower-left, nested L-shaped lines around the bottom-right black square and horizontal lines on the left half. After the flip: parallel diagonals in the upper-left, one diagonal from the top-right black square to the centre, parallel diagonals in the lower-right, nested L-shaped lines around the bottom-left black square and horizontal lines on the right half. Option (4) puts the nested lines around the top-right black square, which does not match. Option (3) shows every one of these features in the correct place. Answer: (3)
