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ICSE Notes 2016 : Physics (Vidya International School (VIS), Yeola)

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Question Bank Electromagnetic Waves and Spectrum 1. Define the term dispersion of light. Ans. The phenomenon due to which white light splits up into seven colours on passing through a prism is called dispersion of light. 2. Explain the cause of dispersion of white light through a prism. Ans. White light is made of seven colour bands (VIBGYOR), such that the rays in each band have different wavelength and different frequencies. When the white light is incident on the refracting face of the prism each coloured ray deviates through different angle, depending upon its wavelength. The red rays deviate least, whereas the violet rays deviate most. It is this differential deviation of rays, which causes dispersion. 3. Draw a diagram showing the dispersion of white light. Can a glass slab disperse white light? If not, why? Ans. Dispersion of white light is shown below. Class-X 1 Question Bank

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