Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.
Diagram:
The various colours are seen- violet, Indigo, blue, green, yellow, orange and red and the sequence will be the same as written.
The acronym is VIBGYOR so that we remember the sequence of colours and the band of coloured components of the light beam is known as spectrum and the splitting of light into its components colours is known as dispersion. The prism splits the incident white light into the band of colours. The dispersion of white light is shown by one activity- take a thick sheet of cardboard and make a small hole in it in its middle. Now allow the sunlight to fall on this slit or hole which gives a narrow beam of white light. Take a glass prism and allow the light from the hole to fall on one of its faces. Now turn the prism slowly until the light comes out of the nearest screen. We will observe the different colour bands.
It bands because of refraction of light. The light deviates from its original path because of the unique shape of the prism. Every coloured band has different speed and contains different angles of deviation. And then it will lead to the appearance of a band of seven colours which are the components of the white light.
You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3.
| Material medium |
Refractive index |
Material medium |
Refractive index |
| Air | 1.0003 | Canada Balsam |
1.53 |
| Ice | 1.31 | ||
| Water | 1.33 | Rock salt | 1.54 |
| Alcohol | 1.36 | ||
| Kerosene | 1.44 | Carbon disulphide |
1.63 |
| Fused quartz |
1.46 | ||
| Turpentine oil |
1.47 | Ruby | 1.71 |
| Benzene | 1.50 | Sapphire | 1.77 |
| Crown glass |
1.52 | Diamond | 2.42 |
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Welcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 29: Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagra....
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