Construction of Periscope:

Periscopes are optical instruments used to view objects that are not in a direct line of sight. They consist of a tube with mirrors that allow the observer to see around obstacles or over barriers. Here is a detailed explanation of the construction of a periscope:

Main Tube:
- The main body of the periscope is a tube usually made of lightweight material such as cardboard, plastic, or metal.
- The length of the tube determines the height of the periscope and the distance over which it can view.

Mirrors:
- Two mirrors are placed at a 45-degree angle inside the tube.
- The first mirror, placed at the bottom of the tube, reflects the light coming in from the lower end at a 90-degree angle.
- The second mirror, placed at the top of the tube, reflects the light from the first mirror towards the eyepiece.

Eyepiece:
- The eyepiece is located at the top of the periscope and allows the observer to view the reflected image.
- It is usually a convex lens that magnifies the image seen through the periscope.

Optional Accessories:
- Some periscopes may have additional features such as focusing mechanisms, handles for easy manipulation, or protective covers for the mirrors.

Assembly:
- To assemble the periscope, the mirrors are carefully positioned inside the tube at the correct angles.
- The mirrors are securely fixed in place to ensure they do not move during use.
- The eyepiece is then attached to the top of the tube to complete the construction.

In conclusion, the construction of a periscope involves the careful arrangement of mirrors inside a tube to allow for viewing objects that are not directly visible. By understanding the components and assembly process, one can appreciate the ingenuity behind this simple yet effective optical device.