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If two convex lenses of focal lengths 10...

If two convex lenses of focal lengths 10 cm and 5 cm are kept in contact with each other , what is their combined focal length ?

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`(10)/(3)` cm [ approximately=3.33 cm]
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NAVNEET PUBLICATION - MAHARASHTRA BOARD-LENSES-Numerical Problems For Practice
  1. Find the focal length of a convex lens which produces a real image at ...

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

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

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  4. An object is kept at 20 cm in front of a convex lens and its real imag...

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  5. An object is kept at 20 cm in front of a convex lens and its real imag...

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  6. An object is kept at 10 cm in front of a convex lens. Its imge is form...

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  7. An object is kept at 10 cm in front of a convex lens. Its imge is form...

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

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

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

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

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  12. Find the power of a convex lens of focal length 12.5

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

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  14. An object of height 4 cm in front of a concave lens of focal length 20...

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  15. If two convex lenses of focal lengths 10 cm and 5 cm are kept in conta...

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  16. If a convex lens of focal length 20 cm and a concave lens of focal len...

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  17. If a convex lens of focal length 20 cm and a concave lens of focal len...

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  18. If a convex lens of focal length 20 cm and a concave lens of focal len...

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

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

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