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Question
What is dispersion? Explain in detail.
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Solution
- Splitting white light into its seven constituent colours (wavelength), on passing through a transparent medium is known as dispersion of light.
- Dispersion occurs because the light of different colours present in white light have different wavelength and they travel at different speeds in a medium.
- The refraction of a light ray in a medium depends on its speed.
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RELATED QUESTIONS
Make two diagrams to explain refraction and dispersion.
In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is ______.
Draw a labeled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism.
What is the cause of the dispersion of white light through a glass prism? Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in an inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the faces of the prisms.
Distinguish between an impure spectrum and a pure spectrum.
Write the range of wavelength of the visible spectrum.
Observe the given figure and write appropriate phenomenon of light in the box.

When white light enters a glass prism from the air, the angle of deviation is least for ____________.
In dispersion, the color of light that will bend more is ______.
Observe the given diagram and answer the questions:

- Name the process shown in the figure.
- Name the colour that deviates the most.
- Name the colour that deviates the least.
- Name any one phenomenon in nature which is based on the above process.
- Define ‘spectrum’.
