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Write the formula for the normal shift a...

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

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Normal shift `NS=t(1-(1)/(""_(1)n_(2)))`
where, NS = normal shift,
t = thickness of a mdium,
`""_(1)n_(2)` = R.I. Of medium (2) w.r.t medium (1)
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SUBHASH PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-TWO MARKS QUESTIONS WITH ANSWERS
  1. Answer the following questions: (b) A virtual image, we always say, ...

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

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

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

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  5. Give any two consequences of refraction of light.

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  6. Write any two practical applications of optical fibres.

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

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  8. Distinguish between a pure and an impure spectrum.

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

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

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  11. Why vaccum is a non-dispersive medium?

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

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

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

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

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  16. Draw a neat labeled diagram of a prism.

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

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

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

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

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