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If two lenses of power +1.5 D and +1.0 D...

If two lenses of power +1.5 D and +1.0 D are placed in contact ,then the effective power of combination will be

A

2.5 D

B

1.5 D

C

0.5 D

D

3.25 D.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
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  2. Two lenses of power +12 D and -2D are combined together.What is their ...

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

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

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

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  6. The sky appears blue, because.

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  7. One cannot see through fog, because:

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

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

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

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

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

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

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

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

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

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  17. Light propagates rectilinearly,because of its

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

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  19. Interference occurs in which of the following waves?

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  20. Ratio of inensitties of two waves is 9:1 iff these waves are superimpo...

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