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Solve the following examples/ numerical problems:
The power of a convex lens is 2.5 dioptres. Find its focal length .

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The correct Answer is:
2 D
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NAVNEET PUBLICATION-LENSES-EXERCISE
  1. An object is kept 60 cm from a lens gives a virtual image 20 cm in fro...

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  2. Solve the following examples/ numerical problems: < br > What is the p...

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  3. Solve the following examples/ numerical problems: The power of a con...

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  4. Calculate the focal length of a corrective lens having power+2.5D.

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  5. Solve the following examples/ numerical problems: Calculate the foca...

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  6. Three lenses having power 2, 2.5 and 1.7 D are kept touching in a row....

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  7. Solve the following examples/ numerical problems: Two convex lenses ...

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  8. Solve the following examples/ numerical problems: Two convex lenses ...

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  9. Solve the following examples/ numerical problems: < br > If a convex l...

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  10. Find the focal length of a convex lens which produces a real image at ...

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  11. Find the focal length of a convex lens which produces a virtual image ...

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  12. A real image is obtained at 30 cm from a convex lens of focal length 7...

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  13. An object is kept at 20 cm in front of a convex lens its real image is...

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  14. An object is kept at 10 cm in front of a convex lens . Its image is f...

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  15. An object is kept at 60 cm in front of a convex lens of focal length 1...

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  16. An object of height 2 cm is kept at 30 cm from a convex lens . Its rea...

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  17. If the power of a lens is 4 dioptres , find its focal length.

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  18. Find the power of a convex lens of focal length 40 cm.

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  19. Find the power of a convex lens of focal length 12.5 cm.

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  20. If for a lens , f= -20 cm, what is the power of the lens ?

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