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In order to obtain a real image of magni...

In order to obtain a real image of magnification 2 using a convergin lens of focal length 20 cm,where should an object be placed?

A

50 cm

B

30 cm

C

`-50 cm`

D

`-30 cm`.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. A screen is placed 80 cm from an object. The image of the object on th...

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  2. Which of the following pairs can produce erect,diminshed and virutual ...

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  3. In order to obtain a real image of magnification 2 using a convergin l...

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  4. Which of the following is true for rays coming from infinity?

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  5. At what angle ,a ray of light will incident on one face of an equilate...

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  6. The blue colour of the sky is due to the phenomenon of

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  7. The sky appears blue, because.

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  8. A red piece of paper when illuminated by green light appears:

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  9. White light is passed through a dilute solution of potasssium permagna...

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  10. C.V. Raman received Nobel Prize for the discovery of the following phe...

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  11. C.V. Raman received Nobel Prize for the discovery of the following phe...

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  12. The formation of rainbow in due to the phenomenon of

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

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

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

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

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

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

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  19. The magnifying power of telescope is high,if

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

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