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A glass prism produces a spectrum when w...

A glass prism produces a spectrum when white light passes through it but a glass slab does not do so. Explain.

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In a glass slab, both the refracting faces are parallel. Dispersion produced by one face is cancelled by the other face and hence no spectrum is produced. In prism, the two refracting faces are not parallel to each other and hence, dispersion produced at the two faces gets added up producing a spectrum.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - VERY SHORT ANSWER TYPE QUESTIONS
  1. Light of two colours A and B passes through a prism. A deviates more t...

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  2. Mention one difference between refraction in a prism and a glass slab.

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  3. A glass prism produces a spectrum when white light passes through it b...

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  4. Why is the path of sunlight visible when it passes through the canopy ...

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  5. Why is it dangerous to drive on a foggy day ?

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  6. Name the colours of spectrum which respectively have (a) maximum wavel...

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  7. Why does disperson occur only on refraction and not on reflection ?

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  8. How does the sky appear from the surface of the moon ?

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  9. What is the reason for atmospheric refraction ?

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  10. On what factor does the colour of the scattered light depend ?

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  11. How does atmospheric refraction affect the duration of the day on the ...

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  12. What is the cause of random wavering or flickering of the objects near...

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  13. Name any two phenomena which arise due to scattering of light in the e...

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  14. What would have been the colour of the sky, in the absence of atmosphe...

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  15. Why are the traffic light-signals [or danger signals] of red colour ?

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  16. What is cornea ?

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  17. Mention the function of eye lens.

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  18. Where does refraction of light rays occur in the human eye ?

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  19. Mention the role of iris in the human eye.

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  20. Which are the light-sensitive cells present in the retina of the human...

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