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Answer the following questions: (b) A ...

Answer the following questions:
(b) A virtual image, we always say, cannot be caught on a screen. Yet when we 'see' a virtual image, we are obviously bringing it on to the 'screen' (i.e., the retina) of our eye. Is there a contradiction?

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When the reflected or refracted rays are divergent, the image is virtual. The convex lens converges this divergent rays. Here the virtual image serves as an object for the eye lens to produce a real image.
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SUBHASH PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-TWO MARKS QUESTIONS WITH ANSWERS
  1. Draw a neat labelled diagram of Cassegrain reflecting telescope.

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  2. Can plane and convex mirrors produce real images? Give an explanation ...

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  3. Answer the following questions: (b) A virtual image, we always say, ...

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

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

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

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  7. Give any two consequences of refraction of light.

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  8. Write any two practical applications of optical fibres.

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

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  10. Distinguish between a pure and an impure spectrum.

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

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

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  13. Why vaccum is a non-dispersive medium?

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

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

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

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

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  18. Draw a neat labeled diagram of a prism.

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

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

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