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Rev. Notes > IGCSE > Light
 
 
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Nature of light

Important features of light

Reflection of light

Use of mirror (Periscope)

Refraction of light

Refractive index

Critical angle

Total internal reflection

Use of prism (Periscope)
Fiber-optics

Convex lens

Behavior of standard rays after passing through convex lens

Image formed by convex lens

Nature and position of image produced by convex lens

Principle of camera

Dispersion of light

Newton's experiment for dispersion of light

Improvement in Newton's experiment for dispersion of light

Recombination of colors

Rainbow

Reflection through plane mirror

Image through plane mirror

Test Yourself

 

Rainbow

The rainbow is a natural phenomenon sometimes seen after a rain. In the seventeenth century a French mathematician Rene Descartes gave the idea that rainbow is produced by the dispersin of light. According the Rene, after the rain showers, a number of droplets of water remain suspended high up in the air. When sun light falls on theses water droplets, it gets splitted, as each drop acts like a prism. So each ray of light after passing through the drop suffers refaction and total internal reflection. The violet colour is refractetd the most and the red colour, at least. Thus the red ray which emerges from each droplet makes greater angle with the horizontal than the violet ray. Simiillarly other coloured rays emerge at different angles to the horizontal. The droplets which are at the same angle from the observer will produce the same colour. Consequently an area of coloured bands called the rainbow appear in teh sky opposite to the sun as shown in the figure below.

The colour in the rainbow are distributed in such a way that violet lies on the inside of the bow, while the red light outside of the bow.

 

 
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