Question

Find mirror image of point representing x+i y on real axis.

(a) (x, y)

(b) (-x, -y)

(c) (-x, y)

(d) (x, -y)

This question was posed to me in an international level competition.

Query is from Argand Plane and Polar Representation in division Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer 1

The correct option is (d) (x, -y)

The best explanation: Mirror image of point (x, y) on real axis is (x, -y).

Since real axis is acting as mirror x-coordinate remains same whereas y-coordinate gets inverted.

So, (x, -y) is mirror image of (x, y) on real axis.