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💬 Think about it
We have learnt two big rules: light travels straight, and mirrors reflect it. Can we use these to build something useful? Soldiers in tanks and children with bangle pieces both say yes. Let us make a periscope and a kaleidoscope.
How can we use reflection to make useful things?
- Light travels in a straight line and reflects off mirrors.
- We can use these ideas to build useful items.
- A periscope lets us see over or around things.
- A kaleidoscope makes beautiful patterns.
Example:
A periscope uses two mirrors so a soldier in a tank can see outside without being seen.
Periscope
Kaleidoscope
Uses two plane mirrors
Uses three mirror strips
Helps see hidden objects
Makes colourful patterns
Used in submarines and tanks
Used by artists for designs
Important Points
- Reflection from mirrors is used to build useful devices.
- A periscope uses two mirrors; a kaleidoscope uses three.
