Describe the construction of a kaleidoscope

Describe the construction of a kaleidoscope. 

Answer: The kaleidoscope is a simple toy that uses the idea of multiple images formed by the combination of plane mirrors. It forms many beautiful and fascinating coloured patterns. 

It is made by taking three plane mirror strips and joining them to form a triangle. A piece of cardboard is wrapped around the mirrors. 

On one side of the tube so formed, we place pieces of glass of different colours between two transparent sheets. 

The other side is closed with a plane transparent sheet. When we see through this end, and rotate the kaleidoscope, we see beautiful coloured patterns.

(Refer to figure 16.12 in NCERT book)