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(a) Why do spectrum colours recombine on...

(a) Why do spectrum colours recombine on passing through two prisms oriented duly ?
(b) What is the essential condition for observing a rainbow ?

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(a) The spectrum colours recombine when (angular) dispersion produced by one prism is equal and opposite to (angular) dispersion produced by the other prism.
(b) The back of the observer of rainbow must be towards the sun.
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PRADEEP-THE HUMAN EYE AND COLOURFUL WORLD-(Additional)Short answer
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  3. (a) Why do spectrum colours recombine on passing through two prisms or...

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  4. (a) Which phenomenon accounts for advanced sunrise and delayed sunset ...

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  5. (a) What is the essential condition for Rayleigh scattering ? (b) In...

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  6. How is the amount of light entering the eye controlled ?

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  7. How do we see colours ?

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  8. Why do different colours deviate through different angles on passing t...

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  9. Give the meaning of the term VIBGYOR. With which phenomenon is it conn...

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  10. What is meant by scattering of light ?

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  11. What is the condition for Rayleigh scattering ?

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  12. What is the order of wavelength of visible light and audible sound?

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  13. What is the size of an air molecule ?

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  14. Can visible light be scattered by atmos//molecules in earth's atmosphe...

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  15. What is the basic cause of atmospheric refraction ?

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  17. In the following diagram, the correctly marked angles are : .

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