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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.
If the angles of the mirrors that you used on periscope are not parallel to each other you would see the image upside down.
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.
As we place two mirrors inclined with each other then many images are formed. If @ is the angle of inclination then number of images is got by the formula [360/@] - 1 Hence as we place the two mirrors at right angles ie 90 degree then number of images will be 3 If both mirrors kept parallel facing each other then infinite images are formed.
infinite mirrors
Adjacent angles are angles next to each other
If you use blemished mirrors, then you cannot.
No vertical angles are across from each other & adjacent angles are beside but opposite from each other.
Plane mirrors are flat mirrors, so bathroom mirrors or even clothes shops mirrors are known as flat mirrors.
A periscope: An optical instrument that uses a series of prisms, lenses and mirrors to reflect images through a tube. Most often associated with submarines but they can also have other practical uses.A periscope works by using mirrors to bounce light from one mirror to the other. A normal periscope uses two mirrors at 45 degrees angles to the direction you want to see. The light bounces from one to the other and then to your eye. A periscope helps you to see around corners and over walls, they are also used on submarines so that they out and see around things.
p orbitals are at right angles to each other, there are three.