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

A vertical mirror is placed, so the object on the left will appear right in reverse position and vice-versa.

So the blank part, i.e. top right area of square will be reversed and will appear at top left, thus the first and last options will be eliminated.

Also, in the question figure, the triangle with half black color is at bottom left, hence it will appear at bottom right side, hence third option is the right image.

=> Ans - (C)