It is not common practice due to the fact that if mirrors are placed at right angles someone else could be looking at your privates from another angle which could be uncomfortable to you or the other person. in other words for basic privacy reasons.
No vertical angles are across from each other & adjacent angles are beside but opposite from each other.
4 right angles, no other angles.
Vertical Angles
adjacent angles
It is not common practice due to the fact that if mirrors are placed at right angles someone else could be looking at your privates from another angle which could be uncomfortable to you or the other person. in other words for basic privacy reasons.
With two mirrors at right angles you will have 3 (360/90 - 1) images of an object. Two of these are primary and the third is secondary. Some light rays from the object bounce of each of the mirrors to your eye to form the two primary images. But there are other rays that bounce off a mirror onto the second mirror before they get to you. This produced the secondary image.
In a periscope, light reflects off a series of mirrors at specific angles. This reflection process causes the image to appear upside down when viewed through the periscope.
A periscope works using two mirrors placed at 45 degree angles and in the direction you wish to see. A periscope uses the two mirrors to bounce light from one place to another. The light comes through the lense, bounces off one mirror to the other and then into the person's eye.
Light enters the periscope through one end and reflects off a series of mirrors inside which are set at specific angles. The mirrors then redirect the light so that it exits through the other end of the periscope, allowing the viewer to see objects or scenes that are not in a direct line of sight.
Adjacent angles are angles next to each other
No vertical angles are across from each other & adjacent angles are beside but opposite from each other.
When two plane mirrors of the same size are placed at different angles to each other, the size of the images they create can appear different due to the way light reflects off them. The angle of incidence and reflection will affect how the rays of light bounce off the mirrors, resulting in variations in the size of the reflected images. Additionally, the position of the observer relative to the mirrors can also impact the perceived size of the images.
p orbitals are at right angles to each other, there are three.
If you use blemished mirrors, then you cannot.
4 right angles, no other angles.
Vertical Angles