If a mirror is placed on the line MN, then which of the answer figures will be the right mirror image of the given figure?

Appeared in: DSSSB -28 August 2019 (Shift-2)

Explanation

The principle of a vertical mirror image is lateral inversion, where the left side of an object becomes the right side in the image, and vice versa.
In the original figure, the two diagonal lines are attached to the left of the central vertical line.
Therefore, in the correct mirror image, these diagonal lines must appear on the right of the central vertical line.
The vertical orientation (top pointing up, bottom pointing down) remains unchanged.
The first option is the only figure that accurately reflects this left-to-right inversion while keeping the vertical orientation correct.

Option B: This option is identical to the original question figure. It shows no reflection or inversion at all.
Option C: This option shows both lateral (left-to-right) and vertical (top-to-bottom) inversion. A vertical mirror only causes lateral inversion.
Option D: This option shows a vertical inversion (top-to-bottom flip), also known as a water image, of the original figure. The diagonal lines remain on the left side.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain This question tests the concept of spatial reasoning, specifically the ability to identify the correct mirror image of a given figure as background academic context rather than a clinical decision trigger.
While not a clinical question, it tests spatial reasoning and attention to detail, which are vital skills for nurses.
Nurses use spatial skills when interpreting medical imaging, such as correctly identifying the left and right sides of a patient on an X-ray or CT scan.
Precise understanding of orientation is critical for tasks like placing ECG leads, setting up sterile fields, or positioning patients for procedures.

How to Approach the Question

First, identify the position and orientation of the mirror, which is the vertical line MN.
Recall the rule for a vertical mirror: it causes lateral inversion, meaning the left side of the object becomes the right side of the image, and vice versa. The top and bottom do not change.
Analyze the key features of the original figure. Note the position of the diagonal lines (on the left) and their direction (one up, one down).
Mentally 'flip' the figure horizontally across the mirror line. The lines on the left should now be on the right.
The line pointing up-left should now point up-right. The line pointing down-left should now point down-right.
Compare this mentally constructed image with each of the four options to find the one that matches perfectly.

Concept Tested & Keywords

Concept Tested: This question tests the concept of spatial reasoning, specifically the ability to identify the correct mirror image of a given figure.
Stem keywords: mirror, mirror image, line MN, right mirror image
Lead-in keywords: which of the answer figures

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Practise the full DSSSB -28 August 2019 (Shift-2)

Attempt every question from this paper in a timed mock, then review the full solution for each one.