It is a toy which contains is made up of multiple plane mirrors.
Due to multiple mirrors, There are multiple reflections of light in a kaleidoscope which forms beautiful pattern.
How to make a Kaleidoscope?
We follow these steps
Take 3 rectangular mirrors
Join them by its length, so that mirrors are facing inwards
Put them in a circular tube made of cardboard. Make sure length of tube is a little longer than the mirrors
Close one end of the tube by cardboard
Make a hole in the center - so that we can see through it
In the other side, place pieces of bangles.
And cover it with a glass plate
The Kaleidoscope is ready
When we peep through hole, and rotate the cardboard tube slightly, we will be able to see beautiful different patterns.