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The focal length of a concavo - convex l...

The focal length of a concavo - convex lens of radii of curvature 5 cm and 10 cm is 20 cm.What will be its focal length in water `(mu=4//3)`?

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MODERN PUBLICATION-REFRACTION OF LIGHT-EXERCISE
  1. The foal length of a glass convex lens in air is 15 cm.Calculate its f...

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  2. A glass (mu=1.5) convex lens of focl length 40 cm is placed in water (...

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  3. The focal length of a concavo - convex lens of radii of curvature 5 cm...

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  4. If the refractive index from air to glass is 3//2 adn that from air to...

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  5. A convex lens of refractive index 1.5 has a focal length of 18 cm in a...

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  6. The radii of curvature of a convex lens are 20 cm and 30 cm nd the re...

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  7. A convex lens of refractive index 1.5 is immersed in a liquid of refra...

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  8. Explain what happens ,when a convex lens of refractive index 1.2 is im...

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  9. A convex lens of refrative index 1.5 is immersed in a liquid of refrac...

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  10. An object is placed at 0.06 m from a convex lens of focal length 0.10 ...

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  11. An object is kept 0.2 m from a conex lens of focal length 0.15 m .Fin...

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  12. A 5.0 cm long needle is placed vertically at a distance 20 cm in front...

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  13. A convex lens of foal length 30 cm and a concave lens of focal length ...

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  14. A ocnverging bem of light forms of a sharp image on a screen. lens is...

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  15. An object is placed at a distance of 75 cm from a screen .Where should...

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  16. The image of needle placed 45 cm from a lens is formed on a screen pl...

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  17. If the distance between the screen and object is 50 cm and the displac...

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  18. A convex lens of focal lenght 20 cm is placed coaxially wih a convex m...

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  19. An object is placed at a distance 5 cm from a convex lens of focal len...

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  20. Where should an object placed from a conveging lens of focal length 20...

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