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Explain why there is an early sunrise or...

Explain why there is an early sunrise or a late sunset.

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During sunrise and sunset, the sun will be at the horizon. The light from the sun travelling from vacuum into air undergoes refraction. Hence the sun appears to rise earlier and lingers a little longer after the sunset.
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SUBHASH PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-TWO MARKS QUESTIONS WITH ANSWERS
  1. Write the formula for the lateral shift and explain the symbols used.

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  2. Write the formula for the normal shift and explain the symbols used.

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  3. Explain why there is an early sunrise or a late sunset.

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  4. Give any two consequences of refraction of light.

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  5. Write any two practical applications of optical fibres.

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  6. What is an optical fibre? Name the principle on which it works.

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  7. Distinguish between a pure and an impure spectrum.

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  8. Define power of a refracting surface. (Define the power of a lens).

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  9. Draw a neat diagram to show dispersion of light in a prism.

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  10. Why vaccum is a non-dispersive medium?

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  11. Can dispersive power of a prism be negative? Give reason for your answ...

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  12. Is the dispersive power independent on the angle of the prism? Give re...

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  13. Draw a graph of angle of deviation versus the angle of incidence in a ...

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  14. Define dispersive power of the material of a prism. How can it be meas...

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  15. Draw a neat labeled diagram of a prism.

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  16. A ray of light incident at 60^(@) on a prism undergoes a deviation of ...

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  17. Draw a neat labeled diagram to obtain an inverted image in the case of...

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  18. Draw a neat labeled diagram to show the turning of light rays through ...

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  19. Draw a neat labeled diagram to show the reflected rays turned through ...

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  20. Write the expression for R.I. of the material of the prism for symmetr...

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