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๐ฌ Think about it
Peep into a kaleidoscope and you see a stunning, ever-changing pattern. Turn it and the pattern is never the same twice. How do a few bangle pieces make such magic? The answer is three mirrors. Let us find out.
How does a kaleidoscope make patterns?
- Three mirror strips are joined in a triangle inside a tube.
- Coloured bangle or bead pieces are placed at one end.
- The three mirrors make many reflections of these pieces.
- So you see beautiful patterns when you peep in.
Example:
Each time you turn the kaleidoscope, a different pattern appears, which artists use to get design ideas.
Important Points
- A kaleidoscope uses three mirror strips in a triangle.
- Many reflections make beautiful changing patterns.
โ Test Yourself
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How many mirrors does a periscope use?
View Answer
Two plane mirrors. -
Where are periscopes used?
View Answer
In submarines, tanks, and bunkers. -
How many mirrors does a kaleidoscope use?
View Answer
Three mirror strips. -
Why does a kaleidoscope show changing patterns?
View Answer
The mirrors make many reflections of the coloured pieces. -
Who uses kaleidoscopes for ideas?
View Answer
Designers and artists.
Important Definitions
- Kaleidoscope — a tube with three mirror strips that makes beautiful changing patterns from coloured pieces by many reflections.
๐ NCERT Question 12 — We do not see
We do not see the shadow of a bird flying high in the sky, but we see it when the bird swoops near the ground. Explain why.
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๐ NCERT Question 9 — Measure the length of
Measure the length of your shadow at 9 AM, 12 PM, and 4 PM. At which time is your shadow the shortest, and why?
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๐ NCERT Question 2 — Match the items in
Match the items in Column A (pinhole camera, opaque object, transparent object, shadow) with those in Column B.
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