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प्रश्न
How does the deviation produced by a triangular prism depend on the colour (or wavelength) of light incident on it?
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उत्तर १
Light of different colours have different speeds in a medium.
Therefore, the refractive index of glass (the material of prism) is different for different colours of light and the deviation caused by a prism is different for different colours of light.
Violet is deviated the most because in glass, speed of violet is least.
Red is deviated the least because in glass, speed of red is most.
उत्तर २
Because different colours have different wavelengths in the medium, the deviation that a prism produces depends on the colour (or wavelengths) of the light that impinges on it. Consequently, for various colours of light, the refractive index of glass (the prism's substance) differs, and the deviation brought about by the prism varies accordingly.
संबंधित प्रश्न
Name three factors on which the deviation produced by a prism depends and state how does it depend on the factors stated by you.
If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?
Draw another diagram to show how the colours of spectrum of white light can be combined to give the effect of white light.
Fig shows part of the arrangement for obtaining pure spectrum.
(a) Complete thediagram and show how to obtain a pure spectrum.
(b) What are the conditions necessary for obtaining a pure spectrum?
Give a reason, why the violet colour of white light deviated most and red colour of white light deviated least.
Explain, why quartz prism is required for obtaining the spectrum of ultra-violet light?
A prism causes dispersion of white light while a rectangular glass block does not. Explain.
Draw a neat diagram to show the arrangement you would use to project a pure spectrum of white light on a screen.
Comment on the statement: ‘When any ray of white light is incident on a glass prism, it simply disperses it into its seven constituent colours.
Write the approximate wavelength for red light.
