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 three parallel line at top right of square will be reversed and will now appear at top left, thus the second and last options will be eliminated.

Also, in the question figure, the line originating from bottom left diagonal will now appear from bottom right, hence third option is the right image.

=> Ans - (C)