A Kaleidoscope is an optical toy that produces beautiful, ever-changing symmetric patterns. It is a classic Class 8 Science project that demonstrates the principle of multiple reflections.
Principle: Multiple reflection of light.
Mirrors: 3 rectangular plane mirrors facing inwards.
Shape: Arranged as a triangular prism.
Result: Produces infinite symmetrical patterns.
Step 1: Making the Prism Take the three rectangular mirror strips and join them together lengthwise using tape to form a hollow triangular prism. Ensure the shiny, reflecting sides are facing inwards.
Step 2: Fitting in the Tube Slide this triangular mirror prism inside the circular cardboard tube.
Step 3: The Viewing End Close one end of the tube with a cardboard disc. Pierce a small hole in the centre of this disc so you can look inside.
Step 4: The Object Chamber At the other end of the tube, fix a circular transparent glass sheet touching the mirrors. Place the small coloured beads and broken bangles on it. Finally, close this end with the frosted (translucent) glass piece. Leave enough space between the two glasses so the beads can move freely.
When you look through the hole and point the frosted glass towards the light while slowly rotating the tube, the coloured pieces tumble around. The three mirrors create multiple reflections of these pieces, forming endless, beautiful, symmetrical patterns. You never see the exact same pattern twice!
A kaleidoscope works on the principle of multiple reflections of light inside a triangular prism made of plane mirrors.
Three rectangular plane mirrors are joined together lengthwise to form a hollow triangular prism, with their reflecting surfaces facing inwards.
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