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(a) A beam of monochromatic light underg...

(a) A beam of monochromatic light undergoes minimum deviation through an equiangular prism. How does the beam pass through the prism with respect to its base?
(b) If white light is used in the same way as in part (a) above, what change do you expect in the emergent beam?
(c) What conclusion do you draw about the nature of white light in part (b)?

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(a) parallel to the base, (b) white light splits into its constituent colours i.e., spectrum is formed (c) white light is polychromatic
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ICSE-SPECTRUM-EXERCISE A
  1. Name three factors on which the deviation produced by a prism depends ...

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  2. How does the deviation produced by a triangular prism depend on the co...

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  3. How does the speed of light in glass change on increasing the waveleng...

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  4. Which colour of white light travels (a) fastest (b) slowest, in glass?

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  5. Name the subjective property of light related to its wavelength.

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  6. What is the range of wavelength of the spectrum of white light in (i) ...

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  7. (a) Write the approximate wavelength for (i) blue, and (ii) red light ...

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  8. Write the seven prominent colours present in white light in the order ...

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  9. Name the seven prominent colours of the white light spectrum in order ...

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  10. Name four colours of the spectrum of white light which have wavelength...

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  11. Which colour of the white light is deviated by a glass prism (i) the m...

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  12. The wavelengths for the light of red and blue colours are nearly 7.8 x...

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  13. Define the term dispersion of light.

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  14. Explain the cause of dispersion of white light through a prism.

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  15. Explain briefly, with the help of a neat labelled diagram, how does wh...

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  16. What do you understand by the term spectrum ?

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  17. A ray of white light is passed through a glass prism and a spectrum is...

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  18. The diagram shown below in Fig. 6.8 shows the path taken by a narrow b...

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  19. Fig. shows a thin beam of white light from a source S striking on one ...

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  20. (a) A beam of monochromatic light undergoes minimum deviation through ...

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