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Two lenses of power +15 D and -5 D are i...

Two lenses of power +15 D and -5 D are in contact with each other forming a comvination lens.
what is the focal length of this combination?

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MODERN PUBLICATION-REFRACTION OF LIGHT-EXERCISE
  1. The image obtained iwth a convex lewns is ereect and its length is fou...

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  2. A lens of focal length 12 cm forms an upright image three times the si...

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  3. A lens of focal length 12 cm produces a virtual image,whose linear dim...

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  4. A lens has a power of +5 D in air.If completely immersed in water,what...

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  5. Find the ratio of the powers of a glass lens in water and in air .Give...

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  6. A glass convex lens has a power of +10 D.When ths lens is totally imme...

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  7. What is the focal length of a convex lens of focal length 30cm in cont...

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  8. A concave lens is placed in contact with a convvex lens of focal lengh...

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  9. Two thin lenses of focal lenths + 10 cm and - 5 cm are kept in contact...

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  10. Two thin lenses of focal lenths + 10 cm and - 5 cm are kept in contact...

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  11. Two lenses of focal length 10 cm and -20 cm are placed in contact .Wha...

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  12. A convex lens of focal lenth 30 cm and a concave lens of focal length ...

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  13. Two lenses of power 15.5 D and -5.5 D are placed in contact.What is te...

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  14. Two thin lenses of pwer +5D and -3D are in contact. What is the focal ...

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  15. A concave lens is kept in contact with a convex lens of focal length 2...

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  16. Two lenses of power +15 D and -5 D are in contact with each other form...

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  17. Two lenses of power +15 D and -5 D are in contact with each other form...

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  18. A compound lens is made of a convex lens of power 10 D and a concave l...

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  19. Two lenses of powers 10D - 5D are placed in contact Calculate the powe...

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  20. Two lenses of power +10 D and -5 D are placed in contact. Where should...

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