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# Dispersion and spectrum of light

Tutormate > CBSE Syllabus-Class 10th Physics > Dispersion and spectrum of light

## 02 Eye

#### DISPERSION OF LIGHT

• The splitting up of white light into seven colours on passing through a transparent medium like a glass prism is called dispersion of light.
• The dispersion of white light occurs because colours of white light travel at different speeds through the glass prism.
• When white light consisting of seven colours falls on a glass prism, each colour in it refracted (or deviated) by a different angle, with the result that seven colours are spread out of form a spectrum.
• The deviation in the path of the light is inversely proportional to the wavelength.
• Red light suffers the least amount of deviation since it has the highest wavelength and violet is deviated the most since it has the lowest wavelength.

#### SPECTRUM OF WHITE LIGHT

The band of seven colours formed on a white screen, when a beam of white light is passed through a glass prism, is called spectrum of white light.

#### THE RAINBOW

• It is a beautiful spectrum seen in the sky when the sun shines on raindrops during or after a rain shower.
• A rainbow is produced by the dispersion of white sunlight by raindrops (or water drops) in the atmosphere.
• The raindrops in the atmosphere act like many small prisms splitting into a spectrum.