Same chapter3 marksDifficulty: Medium
Which points are invariant under a reflection in the line y = −2?
Reflection
3 marksDifficulty: Medium
What is an invariant point under a reflection? Give the invariant points for reflection in the x-axis.
Original Khojo Papers practice question — not from a past board paper.
Answer
An invariant point is a point whose image under the reflection is the point itself. For reflection in the x-axis every point on the x-axis is invariant, that is every point of the form (x, 0).
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
A point is invariant exactly when it lies on the mirror line.
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