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 'Z' shaped figure in the middle will be reversed, thus the first two options will be eliminated.

Also, in the question figure, the figure at the bottom has 6 lines, so it will still appear combination of 6 lines but its position will be reversed, hence the fourth option is the right image.

=> Ans - (D)