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The wavelengths for the light of red and...

The wavelengths for the light of red and blue colours are nearly `7.8 xx 10^(-7) m and 4.8 xx 10^(-7)` m respectively.
(a) Which colour has greater speed in vacuum ?
(b) Which colour has greater speed in glass?

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(a) In vacuum, both have the same speeds.
(b) In glass, red light has a greater speed.
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ICSE-SPECTRUM-EXERCISE A
  1. Name four colours of the spectrum of white light which have wavelength...

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

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

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  4. Define the term dispersion of light.

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

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

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  7. What do you understand by the term spectrum ?

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

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

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

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

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  12. Name three factors on which the deviation produced by a prism depends ...

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

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

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

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

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

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

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

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

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