How is the phenomenon of reflection used in making a kaleidoscope? What are the applications of a kaleidoscope?
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Solution
Kaleidoscope is a cylinder with three mirrors containing loose, coloured objects such as beads or pebbles and bits of glass. As the viewer looks into one end, light entering the other end creates a colourful pattern due to reflection.
It works on the principle of multiple reflections, where several mirrors are placed at an angle (usually 60∘ ) to one another. Typically, these are three rectangular mirrors set to 60∘ to each other so that they form an equilateral triangle.
The 60∘ angle creates seven duplicate images of the objects, 5 at 60∘ and 2 at 90∘. As the tube is rotated, the tumbling of the coloured objects presents varying colours and patterns.
It is used for decoration purposes, toys, etc. It is also useful for designers and artists to get an idea for new patterns to design wallpapers, jewellery and fabrics.