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Solve the following examples/ numerical problems: < br > Aconvex lens forms a real image of a pencil at a distance of 40 cm from the lens . The image is formed is of the same size as the object . Find the focal length and power of the lens . At what distance is the pencil placed from the lens ?

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The correct Answer is:
7.5 m
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NAVNEET PUBLICATION-LENSES-EXERCISE
  1. Solve the following examples/ numerical problems: When a pin of heig...

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  2. Solve the following examples/ numerical problems: < br > At what dista...

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  3. Solve the following examples/ numerical problems: < br > Aconvex lens ...

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  4. Solve the following examples/ numerical problems: < br > A spherical l...

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  5. Solve the following examples/ numerical problems: An object of heigh...

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  6. Solve the following examples/ numerical problems: An object is place...

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  7. Solve the following examples/ numerical problems: 5 cm high object i...

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  8. Doctor has prescribed a lens having power +1.5D. What will be the foca...

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  9. Solve the following examples/ numerical problems: An object of heigh...

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  10. An object is kept 60 cm from a lens gives a virtual image 20 cm in fro...

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

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

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

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

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

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

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

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

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

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

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