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Two lenses having powers + 6 D and - 4D ...

Two lenses having powers + 6 D and - 4D are placed in contact.The power of the combintin is

A

`-2D`

B

`-4D`

C

`+4D`

D

`+2D`

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. A point source of light B,placed in front of the centre of a mirror of...

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  2. Two lenses have powers + 1 D and - 2 D respectively ,The power of comb...

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  3. Two lenses having powers + 6 D and - 4D are placed in contact.The powe...

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  4. An optical (eye specialist)prescibes spetacles is a pateint with a com...

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  5. The focal length of a convex lens is 30 cm and the size of image is qu...

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  6. A screen is placed 80 cm from an object. The image of the object on th...

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

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

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

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

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

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  12. The sky appears blue, because.

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

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

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

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

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

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

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

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

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