The Basics:
* Two Mirrors: A periscope has two mirrors positioned at 45-degree angles.
* Light Path:
* Light enters the periscope through the top opening.
* It strikes the first mirror at a 45-degree angle.
* The mirror reflects the light at a 90-degree angle, sending it down the periscope's tube.
* The light then hits the second mirror, also at a 45-degree angle.
* This mirror reflects the light back up the tube, and it exits the periscope through the bottom opening.
Reflection vs. Refraction:
* Reflection: Light bounces off a surface. Mirrors are highly reflective surfaces designed to cause this.
* Refraction: Light bends as it passes from one medium to another (like air to water).
Why Mirrors in a Periscope?
The angled mirrors allow you to "see around corners" or over obstacles. The light is effectively bent by the mirrors, allowing you to view a scene that would otherwise be hidden from your direct line of sight.
Think of it like this:
Imagine you're looking at a tall object. Instead of straining your neck, you could use a periscope. The first mirror directs the light from the top of the object into the periscope, and the second mirror redirects it to your eye. You see the object as if you were looking directly at it, but you can do so while standing at a lower height.
