You can look over a wall with a periscope because the tube has mirrors what are on a 45 degree angle so the light goes in the top, reflects off the top mirror, then onto the bottom mirror and then into your eyes.
Don't forget:
Light only travels in straight lines
To use a periscope to look over a wall, you would place the periscope on top of the wall and then look into the eyepiece at the other end. The mirrors inside the periscope will reflect the view from above the wall down to your eye, allowing you to see over the wall without exposing yourself.
The basic periscope simply shifts the line of sight, so that you can see around a corner or over a wall. It doesn't necessarily do anything to the image just because it's a periscope. But there's no reason you can't add a telescope or wide-angle viewer to a periscope, or even a zoomer to take you smoothly from a wide-angle to a telephoto, in order to add those functions to the shifted line of sight.
When you look into a periscope, you see a magnified view of what is above the surface of the water. Periscopes are commonly used on submarines to enable viewing above the waterline without the vessel having to surface.
A simple periscope typically uses two mirrors arranged at a 45-degree angle to each other. This allows light to be reflected through the periscope, allowing the viewer to see objects around corners or over obstacles.
A periscope uses mirrors to reflect light, allowing you to see objects that are not in your direct line of sight. When you look through a periscope, you are essentially looking at the reflection of the object rather than directly at it. This design helps in situations where visibility is obstructed or when you need to remain hidden from view.
To use a periscope to look over a wall, you would place the periscope on top of the wall and then look into the eyepiece at the other end. The mirrors inside the periscope will reflect the view from above the wall down to your eye, allowing you to see over the wall without exposing yourself.
periscope.
periscope
To look over pplz heads
The periscope for its purpose is to look around the objects. In greek , 'peri' means around and 'scopus' means to look . hence the name.
Although the use of a periscope to look over the heads of a crowd was first known around 1430 the first person to patented it was Morgan Robertson, around 1920.
When at periscope depth, they look through the periscope. It is a prism arrangement that allows good vision around the area. It also provided for gauging distances with a built in range finder.
the mirrors of a periscope have gotten bigger and are easier to see out of.
An early form of the periscope was used to see over the tops of the trenches.
The word "periscope" is a noun. It refers to a device used for seeing over obstacles or around corners, typically by the use of mirrors and lenses.
This passage describes an army unit.
The basic periscope simply shifts the line of sight, so that you can see around a corner or over a wall. It doesn't necessarily do anything to the image just because it's a periscope. But there's no reason you can't add a telescope or wide-angle viewer to a periscope, or even a zoomer to take you smoothly from a wide-angle to a telephoto, in order to add those functions to the shifted line of sight.