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

Appeared in: DSSSB - 29 August 2019 (Shift-1)

Explanation

The question requires finding the vertical reflection (water image) because the mirror is placed horizontally below the figure.
In a vertical reflection, the top and bottom are swapped, while the left and right positions remain unchanged.
The shapes at the bottom (circle, triangle) move to the top, the arc at the top moves to the bottom, and both the triangle and the circle's internal line are inverted vertically.
Option D correctly shows the circle on the top-left and the inverted triangle on the top-right, with the arc reflected to the bottom-left corner.

Option A: This image represents a horizontal reflection, where left and right are swapped. The question asks for a vertical reflection.
Option B: Although most elements are reflected correctly, the diagonal line inside the circle has not been flipped vertically. It remains in its original top-left to bottom-right orientation.
Option C: This image is the result of a 180-degree rotation of the original figure, not a reflection across the horizontal line.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Mirror Image (Vertical Reflection/Water Image) as background academic context rather than a clinical decision trigger.
This question tests spatial reasoning and the ability to mentally manipulate objects, a skill useful for interpreting diagrams, charts, and schematics in any field.
In a clinical setting, understanding spatial relationships is crucial for tasks like reading anatomical diagrams, interpreting medical imaging (like X-rays from different angles), and correctly placing equipment.
What if the mirror line MN was placed vertically to the right of the figure? The result would be a standard horizontal reflection, where left and right are swapped, and top and bottom remain the same. In that case, Option A would be the correct answer.

How to Approach the Question

First, identify the position of the mirror line (MN). Here, it is horizontal and placed below the figure.
Recognize that a horizontal mirror creates a vertical reflection, also known as a 'water image'.
Recall the rules for a water image: the image is flipped vertically. The top part moves to the bottom, and the bottom part moves to the top.
Crucially, remember that the left and right sides do not change their positions.
Apply this transformation to each element of the original figure (arc, circle, triangle, and the line in the circle) to build a mental picture of the correct answer.
Compare your mental picture with the given options to find the exact match.

Concept Tested & Keywords

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Practise the full DSSSB - 29 August 2019 (Shift-1)

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