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# Kaleidoscope

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### Kaleidoscope

1. 1. KaleidoscopeThe beauty of mirrors <br />By: Cheng Wei Loon 2A1 04<br />
2. 2. Introduction<br />A kaleidoscope is a circle of mirrors containing loose, coloured objects such as beads or pebbles and bits of glass<br />As the viewer looks into one end, light entering the other end creates a colourful pattern, due to the reflection off the mirrors<br />The word "kaleidoscope" is derived from the Ancient Greek words: beauty, shape and tool for examination — hence "observer of beautiful forms."<br />
3. 3. How it works<br />Kaleidoscopes operate on the principle of multiple reflection, where several mirrors are attached together<br />Typically there are three rectangular lengthwise mirrors<br />Setting the mirrors at:<br />45° creates eight duplicate images of the objects<br />Six at 60°<br />Four at 90°<br />
4. 4. How it works<br />As the tube is rotated, the tumbling of the coloured objects presents the viewer with varying colours and patterns<br />Any arbitrary pattern of objects shows up as a beautiful symmetrical pattern created by the reflections in the mirrors<br />A two-mirror model yields a pattern or patterns isolated against a solid black background, while a three-mirror (closed triangle) model yields a pattern that fills the entire field.<br />
5. 5. History<br />Sir David Brewster began work leading towards invention of the kaleidoscope in 1815 when he was conducting experiments on light polarization but it was not patented until two years later<br />His initial design was a tube with pairs of mirrors at one end, pairs of translucent disks at the other, and beads between the two<br />
6. 6. Teleidoscope<br />A teleidoscope is a kind of kaleidoscope, with a lens and an open view, so it can be used to form kaleidoscopic patterns from objects outside the instrument, rather than from items installed as part of it<br />It was invented by John Lyon Burnside III in 1970<br />
7. 7. Advantages of Teleidoscope<br />The lens at the end of the tube is not an optical requirement, but protects the internals of the teleidoscope<br />A spherical ball lens is often used<br />Advantage: It will not press flat against the object being viewed, which would block all light and result in no image being seen<br />
8. 8. Modern Kaleidoscopes<br />Made of brass tubes, stained glass, wood, steel, gourds and almost any other material an artist can sculpt or manipulate<br />The part of the kaleidoscope containing objects to be viewed is the 'object chamber' or 'object cell‘<br />Object cells may contain almost any material<br />Sometimes the object cell is filled with liquid so the items float and move through the object cell with slight movement from the person viewing<br />
9. 9. How to make a kaleidoscope<br />http://www.wonderhowto.com/how-to-make-fun-kaleidoscope-281598/<br />
10. 10. THANK YOU<br />