Final answer:
For a symmetrical object, typically only one or two views are required to show full details. To see the back of your head, a minimum of two mirrors positioned at an angle is necessary.
Step-by-step explanation:
To answer how many views are normally required to show full details of a symmetrical object, it typically takes fewer views than an asymmetrical one because symmetry allows for some parts of the object to be mirrored. In many cases, fully detailing a symmetrical object can be done with a front view and a section view, or sometimes even just a single view will suffice if the object’s symmetry can be clearly understood from that perspective.
When considering the arrangement of mirrors to see the back of your head, the minimum number of mirrors needed is two. By positioning two mirrors at an angle, you can see the reflection of the back of your head in one of the mirrors. This setup is often seen in hair salons or when using a hand mirror in conjunction with a wall mirror at home.