GATE 2021 PH – Question 2
The word PHYLAXIS is shown above the horizontal X-axis in the figure. Which option is its mirror image about the X-axis?

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Correct answer: (B) Figure (B)
Explanation
Reflection about a horizontal axis maps $(x,y)$ to $(x,-y)$. The left-to-right order of the letters therefore stays the same, while each letter is inverted vertically. Applying this to P, H, Y, L, A, X, I and S gives the image in option B.
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