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

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

Third option is eliminated as the two parallel lines at bottom right is not changed to three.

First option is eliminated as the bigger line in the middle will appear on the left.

Last option is eliminated as the triangle in the middle will point towards left, hence second option is the right image.

=> Ans - (B)