Before starting this tutorial, I assume that all the readers have a basic knowledge of 3dsmax.
Most of us know how to create a reflecting mirror in 3D max. It's easy as apple pie. For those who do not know. The steps are here.
Create a plane or a box or any geometry with flat surfaces.
Open material editor and click on the diffuse spot of any empty slot.
Select flat mirror form the new material library.
Apply material to the geometry. (Plane is the best to choose.)
Now, create any object in front of the geometry or the mirror. Add a light, preferably omni in the scene.
Render. Thereflection can be seen clear as a crystal!
For all those artists who have been through this, know its limitations. Flat mirror material cannot reflect its own reflection. Confused? Most of you must have been to a barber shop? What do you find? Two mirrors in front of each other, showing multiple reflections. Flat mirror fails in that way. Either you arrange the scene to cheat a bit or you use one mirror.