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Two lenses of power +12 D and -2D are co...

Two lenses of power +12 D and -2D are combined together.What is their equivalent focal length?

A

10 cm

B

12.5 cm

C

16.6 cm

D

8.33 cm

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. A thin glass (refractie index = 1.5) lens has optical power of -5 D in...

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  2. Two thin lenses of focal length f1 and f2 are placed in contant .The f...

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  3. Two lenses of power +12 D and -2D are combined together.What is their ...

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  4. If two lenses of power +1.5 D and +1.0 D are placed in contact ,then t...

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  5. Flash light equipped witha new set of bateries,produces bright white ...

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  6. The angle of a prism is 6^@ and its refractive index for green light i...

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  7. The sky appears blue, because.

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  8. One cannot see through fog, because:

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  9. A leaf which contains only green pigments is illuminated by a laser li...

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  10. Fraunhofer lines of the solar system is an example of

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  11. A doctor advises a patient to use spectacles with a convx lens of foca...

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  12. A person using a lens as a simple microscope sees a

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  13. The focal length of the objective and eye piece of a telescope are res...

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  14. A telescope has an objective lens of focal length 200 cm and an eye pi...

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  15. The astronomical telescope consists off objective and eye-piece.The fo...

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  16. Four lenses of focal length + 10 cm,+50 cm,+100 cm and + 200 cm are av...

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  17. According to Huygen's principle, light is a form of

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  18. Light propagates rectilinearly,because of its

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  19. Why does light appear to travel in straight line inspite of its wave n...

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  20. Interference occurs in which of the following waves?

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