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A parallel beam of white ligth falls on ...

A parallel beam of white ligth falls on a convex lens .Images of blue ,yellow nd red ligth are formed on the other side of the lens at distnaces 20 cm,20.5 cm and 21.4 cm respectively.The dispersive power of the material of the lens is

A

0.0342

B

0.0683

C

0.0573

D

0.0846.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. The formation of rainbow in due to the phenomenon of

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  2. If red light and violet light rays are of focal length fr adn fv then ...

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  3. A parallel beam of white ligth falls on a convex lens .Images of blue...

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  4. The dispersive powers of the materials of the two lenses are in the r...

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  5. Retina of eye corresponds to which part of camera?

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  6. The ability of eye-lens to adjust its focal length is called……. .

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  7. An astronomical telescope of ten fold angular magnification has a leng...

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  8. The magnifying power of telescope is high,if

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  9. To increse magnifying power of telescope,we sould increase:

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  10. A telescope has focal elngth of objective and eyepiece as 200 cm and 5...

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  11. If size of aperture is decreased,

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  12. The objective with large aperture are used in telescope for

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  13. If in Rmsden's eyepiece,the field lenses have focal lengths f1 and f2 ...

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  14. Huygens' wave theory allows us to know:

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  15. Which of the following does not support the wave nature of light?

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  16. Huygen's wave theory of light could not explain

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  17. Hiygens' concept of secondary waves

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  18. In the ineterference pattern,the energy is

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  19. Two waves of the same equency and intenisty superimpose with each othe...

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  20. Two waves,whose inensitites re 9:16 are made to inrterefere.The ratio ...

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