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💬 Think about it
How does a soldier inside a tank see what is outside? Or how can you peek over a tall crowd? Two mirrors in a Z-shaped box can do this trick. Let us see how a periscope works.
How does a periscope work?
- A periscope uses two plane mirrors in a Z-shaped box.
- Light reflects from one mirror to the other.
- This lets us see objects not visible directly.
- Periscopes are used in submarines, tanks, and bunkers.
Example:
You can use a periscope to look ahead when standing behind taller friends.
Important Points
- A periscope uses two plane mirrors.
- It lets us see objects that are hidden from direct view.
Important Definitions
- Periscope — a device with two plane mirrors that lets us see objects not visible directly.
📋 NCERT Question 11 — Suppose you are given
Suppose you are given a tube of the shape shown in Fig. 11.20 and two plane mirrors. Can this tube be used to make a periscope?
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